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)