PHSColograms® and rotated PHSColograms. - Stephan Meyers; Ellen Sandor; Janine Fron (Comput. Graph., 1995)

Collaborative Visualization: New Advances in Documenting Virtual Reality with IGrams. - Ellen Sandor; Janine Fron; Kristine Greiber; Fernando Orellana; Stephan Meyers; Dana Plepys; Margaret Dolinsky; Mohammed Dastagir Ali (IV, 1999)