Message caching for local and global resource optimization in shared virtual environments. - Helmuth Trefftz; Ivan Marsic (VRST, 2000)

Sharing Viewpoints in Collaborative Virtual Environments. - Steven Valin; Andreea Francu; Helmuth Trefftz; Ivan Marsic (HICSS, 2001)

Observations about an Approximate Algorithm for the Point Robot Motion Planning Problem. - Christian Trefftz; Helmuth Trefftz (SCCC, 2002)

Handling Heterogeneity in Networked Virtual Environments. - Helmuth Trefftz; Ivan Marsic; Michael Zyda (Presence Teleoperators Virtual Environ., 2003)

A Collaborative Tool for Synchronous Distance Education. - Andres Agudelo; Lina Escobar; Juliana Restrepo; Andres Quiroz; Helmuth Trefftz (CATE, 2004)

Editorial. - Juan Guillermo Lalinde Pulido; Helmuth Trefftz (Rev. Colomb. de Computación, 2004)

Telepresence support for synchronous distance. - Juliana Restrepo; Helmuth Trefftz (VRST, 2005)

Distance Interaction in Education Processes using a Telepresence Tool. - Fáber D. Giraldo; Ángela Jiménez; Helmuth Trefftz; Juliana Restrepo; Pedro Esteban (EIAT/IETA, 2008)

Training Geometry Teachers with Support of a Telepresence Tool. - Pedro Esteban; Juliana Restrepo; Helmuth Trefftz (Innovative Techniques in Instruction Technology, E-learning, E-assessment, and Education, 2008)

Understanding Math Concepts Through Computer-Modeled Virtual Objects. - John Trujillo; Pedro Esteban; E. Montoya; R. Giraldo; Alejandro Montoya; J. Mejía; Helmuth Trefftz (Innovative Techniques in Instruction Technology, E-learning, E-assessment, and Education, 2008)

Poster: Collaborative data exploration using two navigation strategies. - Omar Gómez; Helmuth Trefftz; Pierre Boulanger; Walter F. Bischof (3DUI, 2009)

An Interactive Cutting Algorithm With Pattern Recognition For Triangular Meshes. - Amaury Peniche; Christian Diaz; Helmuth Trefftz; Jorge Bernal (CGVR, 2009)

Asignación dinámica de servidores en ambientes virtuales, usando <<Octrees>> para la participación dinámica del espacio. - Alex Restrepo; Alejandro Montoya; Helmuth Trefftz (Rev. Avances en Sistemas Informática, 2009)

Simulating soft tissues using a GPU approach of the mass-spring model. - Christian Andres Diaz Leon; Steven Eliuk; Helmuth Trefftz Gómez (VR, 2010)

Design and Implementation of a Low-Cost Projected Virtual Reality System to Support Learning Processes. - Rodrigo Gómez; Helmuth Trefftz (HCI (23), 2011)

Definición de un marco de desarrollo de sistemas interactivos usables: a partir de la integración de CIAF y MPIu+a. - María L. Villegas; William J. Giraldo; Toni Granollers; Helmuth Trefftz (IHC+CLIHC, 2011)

WeSketch: A 3D Real Time Collaborative Virtual Environment that Improves the GUI Sketching Task. - Hamilton A. Hernández; Helmuth Trefftz (ITNG, 2011)

Ambiente virtual colaborativo 3D para el bosquejo de GUIs en tiempo real. - Hamilton Andrés Hernández Alvarado; Helmuth Trefftz Gómez (Rev. Avances en Sistemas Informática, 2011)

Collaborative Networked Virtual Surgical Simulators (CNVSS): Factors Affecting Collaborative Performance. - Christian Diaz; Helmuth Trefftz; Lucia Quintero; Diego A. Acosta; Sakti Srivastava (Presence Teleoperators Virtual Environ., 2013)

Adaptive Architecture to Support Context-Aware Collaborative Networked Virtual Surgical Simulators (CNVSS). - Christian Diaz; Helmuth Trefftz; Lucia Quintero; Diego A. Acosta; Sakti Srivastava (HCI (17), 2014)

Collaborative Networked Virtual Surgical Simulators (CNVSS) Implementing Hybrid Client-Server Architecture: Factors Affecting Collaborative Performance. - Christian Diaz; Helmuth Trefftz; Lucia Quintero; Diego A. Acosta; Sakti Srivastava (Presence Teleoperators Virtual Environ., 2014)

Multimodal Interaction Modeling. - George V. Popescu; Helmuth Trefftz; Grigore Greg Burdea (Handbook of Virtual Environments, 2nd ed., 2014)

Design and Usability Evaluation of a Multi-input Interface in an idTV Environment. - Juan Felipe Téllez; Juan Carlos Montoya; Helmuth Trefftz (jAUTI, 2016)

Coffee Leaf Rust Dataset. - David Velásquez 001; Alejandro Sánchez; Sebastián Sarmiento; Camilo Velásquez; Mauricio Toro; Edwin Montoya; Mikel Maiza; Basilio Sierra; Helmuth Trefftz (IEEE DataPort, 2020)

Changing perceptions about entrepreneurship and industry-related aspects and fostering innovation skills using a video game. - Henner Andrés Solarte; Hendrys Fabián Tobar; Jorge Hernán Mesa; Helmuth Trefftz; Diana María Osorio (Interact. Technol. Smart Educ., 2021)

A Cyber-Physical Data Collection System Integrating Remote Sensing and Wireless Sensor Networks for Coffee Leaf Rust Diagnosis. - David Velásquez 001; Alejandro Sánchez; Sebastián Sarmiento; Camilo Velásquez; Mauricio Toro; Edwin Montoya; Helmuth Trefftz; Mikel Maiza; Basilio Sierra (Sensors, 2021)