Modeling the Basic Meanings of Path Relations. - Christian Kray; Anselm Blocher (IJCAI, 1999)

RAJA: a resource-adaptive Java agent infrastructure. - Yun Ding; Rainer Malaka; Christian Kray; Michael Schillo (Agents, 2001)

Two Path Prepositions: Along and Past. - Christian Kray; Jörg Baus; Hubert D. Zimmer; Harry R. Speiser; Antonio Krüger (COSIT, 2001)

The Benefits of Multi-Agent Systems in Spatial Reasoning. - Christian Kray (FLAIRS, 2001)

REAL: Ein ressourcenadaptierendes mobiles Navigationssystem. - Wolfgang Wahlster; Jörg Baus; Christian Kray; Antonio Krüger (Inform. Forsch. Entwickl., 2001)

Representation and Processing of Knowledge about Distances in Environmental Spaces. - Christian Kray (Künstliche Intell., 2001)

The eager bidder problem: a fundamental problem of DAI and selected solutions. - Michael Schillo; Christian Kray; Klaus Fischer 001 (AAMAS, 2002)

Frames of Reference, Positional Information and Navigational Assistance. - Jörg Baus; Christian Kray (FLAIRS, 2002)

Some Issues on Presentations in Intelligent Environments. - Christian Kray; Antonio Krüger; Christoph Endres (EUSAI, 2003)

Presenting route instructions on mobile devices. - Christian Kray; Christian Elting; Katri Laakso; Volker Coors (IUI, 2003)

TellMaris and deep map: two navigational assistants. - Katri Laakso; Christian Kray (IUI, 2003)

Situated interaction on spatial topics. - Christian Kray (Aka, 2003)

Using Cooperative Artefacts as Basis for Activity Recognition. - Martin Strohbach; Gerd Kortuem; Hans-Werner Gellersen; Christian Kray (EUSAI, 2004)

Cooperative Artefacts: Assessing Real World Situations with Embedded Technology. - Martin Strohbach; Hans-Werner Gellersen; Gerd Kortuem; Christian Kray (UbiComp, 2004)

Workshop W5: multi-user and ubiquitous user interfaces (MU3I). - Andreas Butz; Antonio Krüger; Christian Kray; Albrecht Schmidt 001 (IUI, 2004)

Interactive Positioning Based on Object Visibility. - Christian Kray; Gerd Kortuem (Mobile HCI, 2004)

Multi-user and ubiquitous user interfaces: (MU3I 2005). - Christian Kray; Andreas Butz; Antonio Krüger; Albrecht Schmidt 001; Helmut Prendinger (IUI, 2005)

Adaptive navigation support with public displays. - Christian Kray; Gerd Kortuem; Antonio Krüger (IUI, 2005)

Exploring bluetooth based mobile phone interaction with the hermes photo display. - Keith Cheverst; Alan J. Dix; Daniel Fitton; Christian Kray; Mark Rouncefield; Corina Sas; George Saslis-Lagoudakis; Jennifer G. Sheridan (Mobile HCI, 2005)

AIMS 2005: artificial intelligence in mobile systems. - Christian Kray; Jörg Baus (Mobile HCI, 2005)

A relative positioning system for co-located mobile devices. - Mike Hazas; Christian Kray; Hans-Werner Gellersen; Henoc Agbota; Gerd Kortuem; Albert Krohn (MobiSys, 2005)

Exploring Mobile Phone Interaction with Situated Displays. - Keith Cheverst; Alan J. Dix; Dan Fitton; Christian Kray; Mark Rouncefield; George Saslis-Lagoudakis; Jennifer G. Sheridan (PERMID, 2005)

Sensing and visualizing spatial relations of mobile devices. - Gerd Kortuem; Christian Kray; Hans-Werner Gellersen (UIST, 2005)

Rapid prototyping and user-centered design of interactive display-based systems. - Daniel Fitton; Keith Cheverst; Christian Kray; Alan J. Dix; Mark Rouncefield; George Saslis-Lagoudakis (IEEE Pervasive Comput., 2005)

Exploring Issues of User Model Transparency and Proactive Behaviour in an Office Environment Control System. - Keith Cheverst; Hee Byun; Dan Fitton; Corina Sas; Christian Kray; Nicolas Villar (User Model. User Adapt. Interact., 2005)

Crossmodal Attention in Public-Private Displays. - Patrick Olivier; Stephen W. Gilroy; Han Cao 002; Daniel Jackson 002; Christian Kray (ICPS, 2006)

Workshop W2: multi-user and ubiquitous user interfaces (MU3I 2006). - Andreas Butz; Christian Kray; Antonio Krüger; Carsten Schwesig (IUI, 2006)

Sharing control of dispersed situated displays between nand residential users. - Christian Kray; Keith Cheverst; Dan Fitton; Corina Sas; John Patterson; Mark Rouncefield; Christoph Stahl (Mobile HCI, 2006)

Immersive video as a rapid prototyping and evaluation tool for mobile and ambient applications. - Pushpendra Singh 001; Hai Nam Ha; Zhiwen Kuang; Patrick Olivier; Christian Kray; Phil T. Blythe; Phil James 002 (Mobile HCI, 2006)

Evaluating Ubiquitous Systems with Users (Workshop Summary). - Christian Kray; Lars Bo Larsen; Patrick Olivier; Margit Biemans; Arthur H. van Bunningen; Mirko Fetter; Tim Jay; Vassilis-Javed Khan; Gerhard Leitner; Ingrid Mulder; Jörg Müller 001; Thomas Plötz; et al. (AmI Workshops, 2007)

Factoring User Experience into the Design of Ambient and Mobile Systems. - Michael D. Harrison; Christian Kray; Zhiyu Sun; Huqiu Zhang (EHCI/DS-VIS, 2007)

Exploring an Option Space to Engineer a Ubiquitous Computing System. - Michael D. Harrison; Christian Kray; José Creissac Campos (FMIS@BCS HCI, 2007)

Adaptive Positioning for Ambient Systems. - Christian Kray; Gerd Kortuem (Künstliche Intell., 2007)

Towards a location model for indoor navigation support through public displays and mobile devices. - Christian Kray; Keith Cheverst; Michael D. Harrison; Fathi Hamhoum; Jürgen Wagner (MIRW, 2008)

Exploring factors that influence the combined use of mobile devices and public displays for pedestrian navigation. - Jörg Müller 001; Marc Jentsch; Christian Kray; Antonio Krüger (NordiCHI, 2008)

Group coordination and negotiation through spatial proximity regions around mobile devices on augmented tabletops. - Christian Kray; Michael Rohs; Jonathan Hook; Sven G. Kratz (Tabletop, 2008)

Evaluating Pervasive and Ubiquitous Systems. - Kay Connelly; Katie A. Siek; Ingrid Mulder; Steve Neely; Graeme Stevenson; Christian Kray (IEEE Pervasive Comput., 2008)

Exploring the use of landmarks for mobile navigation support in natural environments. - Caroline Snowdon; Christian Kray (Mobile HCI, 2009)

Bridging the gap between the Kodak and the Flickr generations: A novel interaction technique for collocated photo sharing. - Christian Kray; Michael Rohs; Jonathan Hook; Sven G. Kratz (Int. J. Hum. Comput. Stud., 2009)

Supporting device discovery and spontaneous interaction with spatial references. - Hans Gellersen; Carl Fischer; Dominique Guinard; Roswitha Gostner; Gerd Kortuem; Christian Kray; Enrico Rukzio; Sara Streng (Pers. Ubiquitous Comput., 2009)

Design by physical composition for complex tangible user interfaces. - Tanja Döring; Bastian Pfleging; Christian Kray; Albrecht Schmidt 001 (CHI Extended Abstracts, 2010)

User-defined gestures for connecting mobile phones, public displays, and tabletops. - Christian Kray; Daniel J. Nesbitt; John Dawson 001; Michael Rohs (Mobile HCI, 2010)

Scalable Navigation Support for Crowds: Personalized Guidance via Augmented Signage. - Fathi Hamhoum; Christian Kray (COSIT, 2011)

Attacking location privacy: exploring human strategies. - Thore Fechner; Christian Kray (UbiComp, 2012)

Visual highlighting on public displays. - Morin Ostkamp; Gernot Bauer; Christian Kray (PerDis, 2012)

Supporting pilgrims in navigating densely crowded religious sites. - Fathi Hamhoum; Christian Kray (Pers. Ubiquitous Comput., 2012)

Transitional Spaces: Between Indoor and Outdoor Spaces. - Christian Kray; Holger Fritze; Thore Fechner; Angela Schwering; Rui Li 023; Vanessa Joy A. Anacta (COSIT, 2013)

Using mobile devices to enable visual multiplexing on public displays: three approaches compared. - Morin Ostkamp; Jonas Hülsermann; Christian Kray; Gernot Bauer (MUM, 2013)

Evaluating Mobile Applications in Virtual Environments: A Survey. - Ioannis Delikostidis; Thore Fechner; Holger Fritze; Ahmed Mahmoud AbdelMouty; Christian Kray (Int. J. Mob. Hum. Comput. Interact., 2013)

Supporting design, prototyping, and evaluation of public display systems. - Morin Ostkamp; Christian Kray (EICS, 2014)

Bridging the Gap Between Field- and Lab-Based User Studies for Location-Based Services. - Ioannis Delikostidis; Holger Fritze; Thore Fechner; Christian Kray (LBS, 2014)

Assessing the Impact of Dynamic Public Signage on Mass Evacuation. - Norman Langner; Christian Kray (PerDis, 2014)

Highlights from MAPINTERACT 2013: the 1st ACM SIGSPATIAL Workshop on Interacting with Maps: held in conjunction with the 21st ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (Orlando, Florida, November 5, 2013). - Falko Schmid; Christian Kray (ACM SIGSPATIAL Special, 2014)

A Gamification Framework for Volunteered Geographic Information. - Roberta Martella; Christian Kray; Eliseo Clementini (AGILE Conf., 2015)

Ethermap: Real-time Collaborative Map Editing. - Thore Fechner; Dennis Wilhelm; Christian Kray (CHI, 2015)

Towards a privacy threat model for public displays. - Morin Ostkamp; Christian Kray; Gernot Bauer (EICS, 2015)

Natural Interaction with Video Environments Using Gestures and a Mirror Image Avatar. - Christian Kray; Dennis Wilhelm; Thore Fechner; Morin Ostkamp (INTERACT (2), 2015)

Community and Governmental Responses to an Urban Flash Flood. - Holger Fritze; Christian Kray (ISCRAM, 2015)

Short-range optical interaction between smartphones and public displays. - Morin Ostkamp; Sven Heitmann; Christian Kray (PerDis, 2015)

Development of a computerised decision aid for thrombolysis in acute stroke care. - Darren Flynn; Daniel J. Nesbitt; Gary A. Ford 002; Peter McMeekin; Helen Rodgers; Christopher Price; Christian Kray; Richard G. Thomson (BMC Medical Informatics Decis. Mak., 2015)

MapInteract 2014 Workshop Report the 2nd ACM SIGSPATIAL International Workshop on Interacting with Maps Dallas, Texas, USA - November 4, 2014. - Falko Schmid; Christian Kray; Holger Fritze (ACM SIGSPATIAL Special, 2015)

Presenting Citizen Engagement Opportunities Online: The Relevancy of Spatial Visualization. - Thore Fechner; Christian Kray (AGILE Conf., 2016)

Visualizing Location Uncertainty on Mobile Devices: Assessing Users' Perception and Preferences. - Champika Manel Ranasinghe; Christian Kray (AGILE Conf., 2016)

Ephemerality Is the New Black: A Novel Perspective on Location Data Management and Location Privacy in LBS. - Mehrnaz Ataei; Christian Kray (LBS, 2016)

Facilitating citizen engagement in situ: assessing the impact of pro-active geofenced notifications. - Thore Fechner; Dominik Schlarmann; Christian Kray (MobileHCI, 2016)

Opening up Smart Cities: Citizen-Centric Challenges and Opportunities from GIScience. - Auriol Degbelo; Carlos Granell; Sergio Trilles; Devanjan Bhattacharya; Sven Casteleyn; Christian Kray (ISPRS Int. J. Geo Inf., 2016)

Follow the Signs - Countering Disengagement from the Real World During City Exploration. - Markus Konkol; Christian Kray; Morin Ostkamp (AGILE Conf., 2017)

COSIT 2017 Short Papers - Introduction. - Christian Kray; May Yuan (COSIT (Workshops/Posters), 2017)

An approach for harvesting, visualizing, and analyzing WebGIS sessions to identify usability issues. - René Unrau; Morin Ostkamp; Christian Kray (EICS, 2017)

Feature-centric ranking algorithms for georeferenced video search. - Holger Fritze; Auriol Degbelo; Tobias Brüggentisch; Christian Kray (SIGSPATIAL/GIS, 2017)

Enabling remote deictic communication with mobile devices: an elicitation study. - Samuel Navas Medrano; Max Pfeiffer; Christian Kray (MobileHCI, 2017)

Public displays for public participation in urban settings: a survey. - Guiying Du; Auriol Degbelo; Christian Kray (PerDis, 2017)

Opening the Publication Process with Executable Research Compendia. - Daniel Nüst; Markus Konkol; Edzer J. Pebesma; Christian Kray; Marc Schutzeichel; Holger Przibytzin; Jörg Lorenz (D Lib Mag., 2017)

Guest editorial: map interaction. - Christian Kray; Falko Schmid; Holger Fritze (GeoInformatica, 2017)

Running with Technology: Evaluating the Impact of Interacting with Wearable Devices on Running Movement. - Matthias Seuter; Max Pfeiffer; Gernot Bauer; Karen Zentgraf; Christian Kray (Proc. ACM Interact. Mob. Wearable Ubiquitous Technol., 2017)

Exploring Forced Migrants (Re)settlement & the Role of Digital Services. - Ana Maria Bustamante Duarte; Auriol Degbelo; Christian Kray (ECSCW Exploratory Papers, 2018)

Intelligent geovisualizations for open government data (vision paper). - Auriol Degbelo; Christian Kray (SIGSPATIAL/GIS, 2018)

Pedestrian navigation and GPS deteriorations: user behavior and adaptation strategies. - Champika Ranasinghe; Sven Heitmann; Albert Hamzin; Max Pfeiffer; Christian Kray (OZCHI, 2018)

Running with drones: desired services and control gestures. - Matthias Seuter; Eduardo Rodriguez Macrillante; Gernot Bauer; Christian Kray (OZCHI, 2018)

Complying with Privacy Legislation: From Legal Text to Implementation of Privacy-Aware Location-Based Services. - Mehrnaz Ataei; Auriol Degbelo; Christian Kray; Vítor Santos 002 (ISPRS Int. J. Geo Inf., 2018)

Visualizing Location Uncertainty on Mobile Devices: Cross-Cultural Differences in Perceptions and Preferences. - Champika Ranasinghe; Jakub Krukar; Christian Kray (Proc. ACM Interact. Mob. Wearable Ubiquitous Technol., 2018)

Gestural interaction with 3D objects shown on public displays: an elicitation study. - Guiying Du; Auriol Degbelo; Christian Kray; Marco Painho (IxD&A, 2018)

Privacy theory in practice: designing a user interface for managing location privacy on mobile devices. - Mehrnaz Ataei; Auriol Degbelo; Christian Kray (J. Locat. Based Serv., 2018)

Location Information Quality: A Review. - Champika Ranasinghe; Christian Kray (Sensors, 2018)

Participatory Design and Participatory Research: An HCI Case Study with Young Forced Migrants. - Ana Maria Bustamante Duarte; Nina Brendel; Auriol Degbelo; Christian Kray (ACM Trans. Comput. Hum. Interact., 2018)

Reproducible Research in Geoinformatics: Concepts, Challenges and Benefits (Vision Paper). - Christian Kray; Edzer J. Pebesma; Markus Konkol; Daniel Nüst (COSIT, 2019)

Evaluating User Experience under Location Quality Variations: A Framework for in-the-wild Studies. - Champika Ranasinghe; Max Pfeiffer; Sven Heitmann; Christian Kray (MobileHCI, 2019)

Visualising Location Uncertainty to Support Navigation under Degraded GPS Signals: a Comparison Study. - Champika Ranasinghe; Nicholas Schiestel; Christian Kray (MobileHCI, 2019)

Map plasticity. - Christian Kray; Auriol Degbelo (CoRR, 2019)

Computational reproducibility in geoscientific papers: Insights from a series of studies with geoscientists and a reproduction study. - Markus Konkol; Christian Kray; Max Pfeiffer (Int. J. Geogr. Inf. Sci., 2019)

Usability evaluation for geographic information systems: a systematic literature review. - René Unrau; Christian Kray (Int. J. Geogr. Inf. Sci., 2019)

User-Generated Gestures for Voting and Commenting on Immersive Displays in Urban Planning. - Guiying Du; Auriol Degbelo; Christian Kray (Multimodal Technol. Interact., 2019)

Creating Interactive Scientific Publications using Bindings. - Markus Konkol; Christian Kray; Jan Suleiman (Proc. ACM Hum. Comput. Interact., 2019)

Interactive Immersive Public Displays as Facilitators for Deeper Participation in Urban Planning. - Guiying Du; Christian Kray; Auriol Degbelo (Int. J. Hum. Comput. Interact., 2020)

Remote Deictic Communication: Simulating Deictic Pointing Gestures across Distances Using Electro Muscle Stimulation. - Samuel Navas Medrano; Max Pfeiffer; Christian Kray (Int. J. Hum. Comput. Interact., 2020)

Recognizing Running Movement Changes with Quaternions on a Sports Watch. - Matthias Seuter; Alexandra Pollock; Gernot Bauer; Christian Kray (Proc. ACM Interact. Mob. Wearable Ubiquitous Technol., 2020)

Mining Map Interaction Semantics in web-based Geographic Information Systems (WebGIS) for Usability Analysis. - René Unrau; Christian Kray (AGILE Conf., 2021)

Enhancing Usability Evaluation of Web-Based Geographic Information Systems (WebGIS) with Visual Analytics. - René Unrau; Christian Kray (GIScience (I), 2021)

Geofreebie: a location-based freecycling app to support forced migrant resettlement. - Lucas Braun; Auriol Degbelo; Christian Kray (J. Locat. Based Serv., 2021)

'Informed' consent in popular location based services and digital sovereignty. - Jerome Dreyer; Sven Heitmann; Felix Erdmann; Gernot Bauer; Christian Kray (J. Locat. Based Serv., 2022)

Interaction pattern analysis for WebGIS usability evaluation. - René Unrau; Aditya Kudekar; Christian Kray (Trans. GIS, 2022)

Towards dynamically generating immersive video scenes for studying human-environment interactions. - Simon Schröder; Jan Stenkamp; Michael Brüggemann; Benjamin Karic; Judith Anne Verstegen; Christian Kray (AGILE Conf., 2023)

Map Reproducibility in Geoscientific Publications: An Exploratory Study. - Eftychia Koukouraki; Christian Kray (GIScience, 2023)

Design and Effect of Guiding Sound for Pedestrians While Maintaining the Streetscape Perception. - Noko Kuratomo; Benjamin Karic; Christian Kray (SUI, 2023)

Using an Immersive Video Environment to Assess Pedestrians' Compliance With COVID Distance Keeping Interventions. - Jan Stenkamp; Benjamin Karic; Paula Scharf; Judith Anne Verstegen; Christian Kray (Interact. Comput., 2023)

FreeMapRetrieve: Freehand Gestures for Retrieve Operations in Large-Screen Map Environments. - Jonas Hurst; Auriol Degbelo; Christian Kray (AGILE Conf., 2024)

Collecting Data in an Immersive Video Environment to Set up an Agent-Based Model of Pedestrians' Compliance with COVID-Related Interventions. - Benjamin Karic; Jan Stenkamp; Michael Brüggemann; Simon Schröder; Christian Kray; Judith Verstegen (J. Artif. Soc. Soc. Simul., 2024)

Linking location privacy, digital sovereignty and location-based services: a meta review. - Simge Özdal-Oktay; Sven Heitmann; Christian Kray (J. Locat. Based Serv., 2024)

Assessing Map Reproducibility with Visual Question-Answering: An Empirical Evaluation. - Eftychia Koukouraki; Auriol Degbelo; Christian Kray (GIScience, 2025)

Approximate vs. precise location in popular location-based services. - Sven Heitmann; Alexia Pagotto; Christian Kray (J. Locat. Based Serv., 2025)