The time geography project: using computer graphics to visualize problems in social science. - Kajsa Ellegård; Johan Torne; Henric Joanson; Anders Ynnerman; Matthew Cooper 001; Mark Ollila (SIGGRAPH Abstracts and Applications, 2002)

Time-geographical design and analysis of user interaction in virtual environments. - Henric Joanson; Peter Blom (SIGGRAPH Posters, 2004)