User interface requirements for face to face groupware. - Mary Elwart-Keys; David Halonen; Marjorie S. Horton; Robert Kass; Paul Scott 001 (CHI, 1990)

Shared hardware: a novel technology for computer support of face to face meetings. - David Halonen; Marjorie S. Horton; Robert Kass; Paul Scott 001 (COCS, 1990)