Jaroslav Opatrny

According to our database, Jaroslav Opatrny authored at least 99 papers between 1974 and 2024.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of three.

2024

The En Route Truck-Drone Delivery Problem.

Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Denis Pankratov

CoRR, 2024

2021

On synchronization and orientation in distributed barrier coverage with relocatable sensors.

Mohsen Eftekhari, Paola Flocchini, Lata Narayanan, Jaroslav Opatrny, Nicola Santoro

Theor. Comput. Sci., 2021

Time-energy tradeoffs for evacuation by two robots in the wireless model.

Jurek Czyzowicz, Konstantinos Georgiou, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Manuel Lafond, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Theor. Comput. Sci., 2021

Search on a Line by Byzantine Robots.

Jurek Czyzowicz, Konstantinos Georgiou, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Int. J. Found. Comput. Sci., 2021

The Bike Sharing Problem.

Jurek Czyzowicz, Konstantinos Georgiou, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Denis Pankratov

Proceedings of the WALCOM: Algorithms and Computation, 2021

Graph Exploration by Energy-Sharing Mobile Agents.

Jurek Czyzowicz, Stefan Dobrev, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Denis Pankratov, Sunil M. Shende

Proceedings of the Structural Information and Communication Complexity, 2021

Group Evacuation on a Line by Agents with Different Communication Abilities.

Jurek Czyzowicz, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Denis Pankratov, Sunil M. Shende

Proceedings of the 32nd International Symposium on Algorithms and Computation, 2021

2020

Priority evacuation from a disk: The case of <i>n</i> ≥ 4.

Jurek Czyzowicz, Konstantinos Georgiou, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Theor. Comput. Sci., 2020

Priority evacuation from a disk: The case of <i>n</i> = 1, 2, 3.

Jurek Czyzowicz, Konstantinos Georgiou, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Theor. Comput. Sci., 2020

Evacuating Robots from a Disk Using Face-to-Face Communication.

Jurek Czyzowicz, Konstantinos Georgiou, Evangelos Kranakis, Lata Narayanan, Jaroslav Opatrny, Birgit Vogtenhuber

Discret. Math. Theor. Comput. Sci., 2020

Optimal online and offline algorithms for robot-assisted restoration of barrier coverage.

Jurek Czyzowicz, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny

Discret. Appl. Math., 2020

Evacuating equilateral triangles and squares in the face-to-face model.

Huda Chuangpishit, Saeed Mehrabi, Lata Narayanan, Jaroslav Opatrny

Comput. Geom., 2020

Weak Coverage of a Rectangular Barrier.

Stefan Dobrev, Evangelos Kranakis, Danny Krizanc, Manuel Lafond, Ján Manuch, Lata Narayanan, Jaroslav Opatrny, Ladislav Stacho

Algorithmica, 2020

Minimizing The Maximum Distance Traveled To Form Patterns With Systems of Mobile Robots.

Jared Ray Coleman, Evangelos Kranakis, Oscar Morales-Ponce, Jaroslav Opatrny, Jorge Urrutia, Birgit Vogtenhuber

Proceedings of the 32nd Canadian Conference on Computational Geometry, 2020

2019

Search on a line with faulty robots.

Jurek Czyzowicz, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny

Distributed Comput., 2019

Exploration of High-Dimensional Grids by Finite State Machines.

Stefan Dobrev, Lata Narayanan, Jaroslav Opatrny, Denis Pankratov

CoRR, 2019

Distributed Pattern Formation in a Ring.

Anne-Laure Ehresmann, Manuel Lafond, Lata Narayanan, Jaroslav Opatrny

Proceedings of the Structural Information and Communication Complexity, 2019

Exploration of High-Dimensional Grids by Finite Automata.

Stefan Dobrev, Lata Narayanan, Jaroslav Opatrny, Denis Pankratov

Proceedings of the 46th International Colloquium on Automata, Languages, and Programming, 2019

Energy Consumption of Group Search on a Line.

Jurek Czyzowicz, Konstantinos Georgiou, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Manuel Lafond, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Proceedings of the 46th International Colloquium on Automata, Languages, and Programming, 2019

Evacuation of Equilateral Triangles by Mobile Agents of Limited Communication Range.

Iman Bagheri, Lata Narayanan, Jaroslav Opatrny

Proceedings of the Algorithms for Sensor Systems, 2019

2018

Priority Evacuation from a Disk Using Mobile Robots.

Jurek Czyzowicz, Konstantinos Georgiou, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

CoRR, 2018

Priority Evacuation from a Disk Using Mobile Robots - (Extended Abstract).

Jurek Czyzowicz, Konstantinos Georgiou, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Proceedings of the Structural Information and Communication Complexity, 2018

Satisfying Neighbor Preferences on a Circle.

Danny Krizanc, Manuel Lafond, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Proceedings of the LATIN 2018: Theoretical Informatics, 2018

God Save the Queen.

Jurek Czyzowicz, Konstantinos Georgiou, Ryan Killick, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Proceedings of the 9th International Conference on Fun with Algorithms, 2018

2017

Optimal Local Buffer Management for Information Gathering with Adversarial Traffic.

Stefan Dobrev, Manuel Lafond, Lata Narayanan, Jaroslav Opatrny

Proceedings of the 29th ACM Symposium on Parallelism in Algorithms and Architectures, 2017

Evacuating an Equilateral Triangle in the Face-to-Face Model.

Huda Chuangpishit, Saeed Mehrabi, Lata Narayanan, Jaroslav Opatrny

Proceedings of the 21st International Conference on Principles of Distributed Systems, 2017

Weak Coverage of a Rectangular Barrier.

Stefan Dobrev, Evangelos Kranakis, Danny Krizanc, Manuel Lafond, Ján Manuch, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende, Ladislav Stacho

Proceedings of the Algorithms and Complexity - 10th International Conference, 2017

Linear Search with Terrain-Dependent Speeds.

Jurek Czyzowicz, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Proceedings of the Algorithms and Complexity - 10th International Conference, 2017

2016

Distributed algorithms for barrier coverage using relocatable sensors.

Mohsen Eftekhari Hesari, Evangelos Kranakis, Danny Krizanc, Oscar Morales-Ponce, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Distributed Comput., 2016

Connectivity with directional antennas in the symmetric communication model.

Stefan Dobrev, Mohsen Eftekhari Hesari, Fraser MacQuarie, Ján Manuch, Oscar Morales-Ponce, Lata Narayanan, Jaroslav Opatrny, Ladislav Stacho

Comput. Geom., 2016

2015

Complexity of barrier coverage with relocatable sensors in the plane.

Stefan Dobrev, Stephane Durocher, Mohsen Eftekhari Hesari, Konstantinos Georgiou, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende, Jorge Urrutia

Theor. Comput. Sci., 2015

Monitoring the Plane with Rotating Radars.

Jurek Czyzowicz, Stefan Dobrev, Benson L. Joeris, Evangelos Kranakis, Danny Krizanc, Ján Manuch, Oscar Morales-Ponce, Jaroslav Opatrny, Ladislav Stacho, Jorge Urrutia

Graphs Comb., 2015

Evacuating Robots from a Disk Using Face-to-Face Communication (Extended Abstract).

Jurek Czyzowicz, Konstantinos Georgiou, Evangelos Kranakis, Lata Narayanan, Jaroslav Opatrny, Birgit Vogtenhuber

Proceedings of the Algorithms and Complexity - 9th International Conference, 2015

Wireless Autonomous Robot Evacuation from Equilateral Triangles and Squares.

Jurek Czyzowicz, Evangelos Kranakis, Danny Krizanc, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Proceedings of the Ad-hoc, Mobile, and Wireless Networks - 14th International Conference, 2015

2014

Optimal Sensor Networks for Area Monitoring Using Rotating and Beam Sensors.

Stefan Dobrev, Lata Narayanan, Jaroslav Opatrny

Theory Comput. Syst., 2014

Distributed Barrier Coverage with Relocatable Sensors.

Mohsen Eftekhari Hesari, Paola Flocchini, Lata Narayanan, Jaroslav Opatrny, Nicola Santoro

Proceedings of the Structural Information and Communication Complexity, 2014

Efficient Beacon-Less Broadcasting in MANETs.

Louisa Harutyunyan, Jaroslav Opatrny

Proceedings of the 28th IEEE International Conference on Advanced Information Networking and Applications, 2014

2013

3D Local Algorithm for Dominating Sets of Unit Disk Graphs.

Alaa Eddien Abdallah, Thomas Fevens, Jaroslav Opatrny

Ad Hoc Sens. Wirel. Networks, 2013

Expected sum and maximum of displacement of random sensors for coverage of a domain: extended abstract.

Evangelos Kranakis, Danny Krizanc, Oscar Morales-Ponce, Lata Narayanan, Jaroslav Opatrny, Sunil M. Shende

Proceedings of the 25th ACM Symposium on Parallelism in Algorithms and Architectures, 2013

On Multi-round Sensor Deployment for Barrier Coverage.

Mohsen Eftekhari Hesari, Lata Narayanan, Jaroslav Opatrny

Proceedings of the IEEE 10th International Conference on Mobile Ad-Hoc and Sensor Systems, 2013

2012

Optimizing Data Throughput in Client/Server Systems by keeping Queue Sizes Balanced.

Evangelos Kranakis, Danny Krizanc, Ioannis Lambadaris, Lata Narayanan, Jaroslav Opatrny

Discret. Math. Algorithms Appl., 2012

Strong Connectivity in Sensor Networks with given Number of Directional Antennae of Bounded Angle.

Stefan Dobrev, Evangelos Kranakis, Danny Krizanc, Jaroslav Opatrny, Oscar Morales-Ponce, Ladislav Stacho

Discret. Math. Algorithms Appl., 2012

2011

Local 7-coloring for planar subgraphs of unit disk graphs.

Jurek Czyzowicz, Stefan Dobrev, Hernán González-Aguilar, Rastislav Kralovic, Evangelos Kranakis, Jaroslav Opatrny, Ladislav Stacho, Jorge Urrutia

Theor. Comput. Sci., 2011

Minimizing the number of sensors moved on line barriers.

Mona Mehrandish, Lata Narayanan, Jaroslav Opatrny

Proceedings of the 2011 IEEE Wireless Communications and Networking Conference, 2011

New routing algorithms to balance traffic load.

Mohsen Eftekhari Hesari, Lata Narayanan, Jaroslav Opatrny

Proceedings of the 2011 IEEE Wireless Communications and Networking Conference, 2011

2010

Power-aware semi-beaconless 3D georouting algorithms using adjustable transmission ranges for wireless ad hoc and sensor networks.

Alaa Eddien Abdallah, Thomas Fevens, Jaroslav Opatrny, Ivan Stojmenovic

Ad Hoc Networks, 2010

Efficient Algorithms for Connected Dominating Sets in Ad Hoc Networks.

Hossein Kassaei, Mona Mehrandish, Lata Narayanan, Jaroslav Opatrny

Proceedings of the 2010 IEEE Wireless Communications and Networking Conference, 2010

Optimal Balancing of Satellite Queues in Packet Transmission to Ground Stations.

Evangelos Kranakis, Danny Krizanc, Ioannis Lambadaris, Lata Narayanan, Jaroslav Opatrny

Proceedings of the Combinatorial Optimization and Applications, 2010

On Minimizing the Sum of Sensor Movements for Barrier Coverage of a Line Segment.

Jurek Czyzowicz, Evangelos Kranakis, Danny Krizanc, Ioannis Lambadaris, Lata Narayanan, Jaroslav Opatrny, Ladislav Stacho, Jorge Urrutia, Mohammadreza Yazdani

Proceedings of the Ad-Hoc, Mobile and Wireless Networks, 9th International Conference, 2010

2009

Local edge colouring of Yao-like subgraphs of Unit Disk Graphs.

Jurek Czyzowicz, Stefan Dobrev, Evangelos Kranakis, Jaroslav Opatrny, Jorge Urrutia

Theor. Comput. Sci., 2009

A new local algorithm for backbone formation in ad hoc networks.

Hossein Kassaei, Mona Mehrandish, Lata Narayanan, Jaroslav Opatrny

Proceedings of the 6th ACM International Workshop on Performance Evaluation of Wireless Ad Hoc, 2009

A Hybrid Ant-Colony Routing Algorithm for Mobile Ad-Hoc Networks.

Shahab Kamali, Jaroslav Opatrny

Proceedings of the Complex Sciences, 2009

A local algorithm for dominating sets of quasi-unit disk graphs.

Yonatan Cohen, Jaroslav Opatrny

Proceedings of the Canadian Conference on Computer Science & Software Engineering, 2009

On Minimizing the Maximum Sensor Movement for Barrier Coverage of a Line Segment.

Jurek Czyzowicz, Evangelos Kranakis, Danny Krizanc, Ioannis Lambadaris, Lata Narayanan, Jaroslav Opatrny, Ladislav Stacho, Jorge Urrutia, Mohammadreza Yazdani

Proceedings of the Ad-Hoc, Mobile and Wireless Networks, 8th International Conference, 2009

2008

A Position Based Ant Colony Routing Algorithm for Mobile Ad-hoc Networks.

Shahab Kamali, Jaroslav Opatrny

J. Networks, 2008

High delivery rate position-based routing algorithms for 3D ad hoc networks.

Alaa Eddien Abdallah, Thomas Fevens, Jaroslav Opatrny

Comput. Commun., 2008

Introduction to the Special Issue.

Evangelos Kranakis, Jaroslav Opatrny

Ad Hoc Sens. Wirel. Networks, 2008

Local Algorithms for Dominating and Connected Dominating Sets of Unit Disk Graphs with Location Aware Nodes.

Jurek Czyzowicz, Stefan Dobrev, Thomas Fevens, Hernán González-Aguilar, Evangelos Kranakis, Jaroslav Opatrny, Jorge Urrutia

Proceedings of the LATIN 2008: Theoretical Informatics, 2008

2007

Power-Aware 3D Position-based Routing Algorithms for Ad Hoc Networks.

Alaa Eddien Abdallah, Thomas Fevens, Jaroslav Opatrny

Proceedings of IEEE International Conference on Communications, 2007

2006

Route discovery with constant memory in oriented planar geometric networks.

Edgar Chávez, Stefan Dobrev, Evangelos Kranakis, Jaroslav Opatrny, Ladislav Stacho, Jorge Urrutia

Networks, 2006

Randomized 3D Position-based Routing Algorithms for Ad-hoc Networks.

Alaa Eddien Abdallah, Thomas Fevens, Jaroslav Opatrny

Proceedings of the 3rd Annual International ICST Conference on Mobile and Ubiquitous Systems: Computing, 2006

Local Construction of Planar Spanners in Unit Disk Graphs with Irregular Transmission Ranges.

Edgar Chávez, Stefan Dobrev, Evangelos Kranakis, Jaroslav Opatrny, Ladislav Stacho, Jorge Urrutia

Proceedings of the LATIN 2006: Theoretical Informatics, 2006

Hybrid Position-Based 3D Routing Algorithms with Partial Flooding.

Alaa Eddien Abdallah, Thomas Fevens, Jaroslav Opatrny

Proceedings of the Canadian Conference on Electrical and Computer Engineering, 2006

2005

Wavelength routing of uniform instances in all-optical rings.

Lata Narayanan, Jaroslav Opatrny

Discret. Optim., 2005

Half-Space Proximal: A New Local Test for Extracting a Bounded Dilation Spanner of a Unit Disk Graph.

Edgar Chávez, Stefan Dobrev, Evangelos Kranakis, Jaroslav Opatrny, Ladislav Stacho, Héctor Tejeda, Jorge Urrutia

Proceedings of the Principles of Distributed Systems, 9th International Conference, 2005

A Generalization of the Face Routing Algorithm to a Class of Non-Planar Networks.

Sabeel Ansari, Lata Narayanan, Jaroslav Opatrny

Proceedings of the 2nd Annual International Conference on Mobile and Ubiquitous Systems (MobiQuitous 2005), 2005

Position-Based Routing on 3-D Geometric Graphs in Mobile Ad Hoc Networks.

George S.-C. Kao, Thomas Fevens, Jaroslav Opatrny

Proceedings of the 17th Canadian Conference on Computational Geometry, 2005

2004

Traversal of a quasi-planar subdivision without using mark bits.

Edgar Chávez, Stefan Dobrev, Evangelos Kranakis, Jaroslav Opatrny, Ladislav Stacho, Jorge Urrutia

J. Interconnect. Networks, 2004

Two-Hop Virtual Path Layout in Tori.

Sébastien Choplin, Lata Narayanan, Jaroslav Opatrny

Proceedings of the Structural Information and Communication Complexity, 2004

Morelia Test: Improving the Efficiency of the Gabriel Test and Face Routing in Ad-Hoc Networks.

Paul Boone, Edgar Chávez, Lev Gleitzky, Evangelos Kranakis, Jaroslav Opatrny, Gelasio Salazar, Jorge Urrutia

Proceedings of the Structural Information and Communication Complexity, 2004

2003

Robust position-based routing in wireless ad hoc networks with irregular transmission ranges.

Lali Barrière, Pierre Fraigniaud, Lata Narayanan, Jaroslav Opatrny

Wirel. Commun. Mob. Comput., 2003

Uniform multi-hop all-to-all optical routings in rings.

Jaroslav Opatrny

Theor. Comput. Sci., 2003

Longest subsequences in permutations.

Michael H. Albert, Robert E. L. Aldred, Michael D. Atkinson, Hans P. van Ditmarsch, B. D. Handley, Chris C. Handley, Jaroslav Opatrny

Australas. J Comb., 2003

Dynamic construction of Bluetooth scatternets of fixed degree and low diameter.

Lali Barrière, Pierre Fraigniaud, Lata Narayanan, Jaroslav Opatrny

Proceedings of the Fourteenth Annual ACM-SIAM Symposium on Discrete Algorithms, 2003

2001

All-to-All Optical Routing in Chordal Rings of Degree 4.

Lata Narayanan, Jaroslav Opatrny, Dominique Sotteau

Algorithmica, 2001

2000

Embeddings of Complete Binary Trees into Grids and Extended Grids with Total Vertex-congestion 1.

Jaroslav Opatrny, Dominique Sotteau

Discret. Appl. Math., 2000

Optical Routing of Uniform Instances in Tori.

Francesc Comellas, Margarida Mitjana, Lata Narayanan, Jaroslav Opatrny

Proceedings of the Mathematical Foundations of Computer Science 2000, 2000

Wavelength Routing of Uniform Instances in Optical Rings.

Lata Narayanan, Jaroslav Opatrny

Proceedings of the ICALP Workshops 2000, 2000

1999

Compact Routing on Chordal Rings of Degree 4.

Lata Narayanan, Jaroslav Opatrny

Algorithmica, 1999

All-to-All Optical Routing in Optimal Chordal Rings of Degree Four.

Lata Narayanan, Jaroslav Opatrny, Dominique Sotteau

Proceedings of the Tenth Annual ACM-SIAM Symposium on Discrete Algorithms, 1999

1998

Embedding Complete Binary Trees Into Star and Pancake Graphs.

Abdelmadjid Bouabdallah, Marie-Claude Heydemann, Jaroslav Opatrny, Dominique Sotteau

Theory Comput. Syst., 1998

Network Properties of Double and Triple Fixed Step Graphs.

Arthur L. Liestman, Jaroslav Opatrny, Marisa Zaragozá

Int. J. Found. Comput. Sci., 1998

1997

Compact Routing on Chordal Rings.

Lata Narayanan, Jaroslav Opatrny

Proceedings of the SIROCCO'97, 1997

1996

DCC Linear Congruential Graphs: A New Class of Interconnection Networks.

Jaroslav Opatrny, Dominique Sotteau, N. Srinivasan, Krishnaiyan Thulasiraman

IEEE Trans. Computers, 1996

Embeddings of Complete Binary Trees into Extended Grids with Edge-congestion 1*.

Marie-Claude Heydemann, Dominique Sotteau, Jaroslav Opatrny

Parallel Algorithms Appl., 1996

1995

Embeddings of complete binary trees into star graphs with congestion 1.

Marie-Claude Heydemann, Jaroslav Opatrny, Dominique Sotteau

Proceedings of the 28th Annual Hawaii International Conference on System Sciences (HICSS-28), 1995

1994

Forwarding indices of consistent routings and their complexity.

Marie-Claude Heydemann, J. C. Meyer, Dominique Sotteau, Jaroslav Opatrny

Networks, 1994

Embeddings of Hypercubes and Grids into de Bruijn Graphs.

Marie-Claude Heydemann, Jaroslav Opatrny, Dominique Sotteau

J. Parallel Distributed Comput., 1994

Multidimensional Linear Congruential Graphs.

C. C. Koung, Jaroslav Opatrny

RAIRO Theor. Informatics Appl., 1994

Embedding Complete Binary Trees into Star Networks.

Abdelmadjid Bouabdallah, Marie-Claude Heydemann, Jaroslav Opatrny, Dominique Sotteau

Proceedings of the Mathematical Foundations of Computer Science 1994, 1994

1992

Broadcasting and Spanning Trees in de Bruijn and Kautz Networks.

Marie-Claude Heydemann, Jaroslav Opatrny, Dominique Sotteau

Discret. Appl. Math., 1992

Forwarding Indices of <i>k</i>-Connected Graphs.

Marie-Claude Heydemann, J. C. Meyer, Jaroslav Opatrny, Dominique Sotteau

Discret. Appl. Math., 1992

1991

Embeddings of Shuffle-Like Graphs in Hyphercubes.

Marc Baumslag, Marie-Claude Heydemann, Jaroslav Opatrny, Dominique Sotteau

Proceedings of the PARLE '91: Parallel Architectures and Languages Europe, 1991

1988

Bigeodetic graphs.

N. Srinivasan, Jaroslav Opatrny, Vangalur S. Alagar

Graphs Comb., 1988

1986

The bandwidth problem and operations on graphs.

J. Chvatalova, Jaroslav Opatrny

Discret. Math., 1986

1982

NOVAC: a non-tree variable tree for combinatorial computing.

Bipin C. Desai, Clement Wing Hong Lam, J. William Atwood, Jaroslav Opatrny, Peter Grogono, S. Cabilio

Proceedings of the International Conference on Parallel Processing, 1982

1979

Total Ordering Problem.

Jaroslav Opatrny

SIAM J. Comput., 1979

1975

Time Complexity of Recognition and Parsing of E0L-Languages.

Jaroslav Opatrny, Karel Culík II

Proceedings of the Automata, Languages, Development: At the crossroads of biology, mathematics and computer science, result of an international conference held at Noordwijkerhout, The Netherlands, March 31, 1975

1974

Context in Parallel Rewriting.

Karel Culík II, Jaroslav Opatrny

Proceedings of the L Systems, 1974