Integrating Simultaneous Input from Speech, Gaze, and Hand Gestures. - David B. Koons; Carlton J. Sparrell; Kristinn R. Thórisson (AAAI Workshop on Intelligent Multimedia Interfaces, 1991)

Iconic: speech and depictive gestures at the human-machine interface. - David B. Koons; Carlton J. Sparrell (CHI Conference Companion, 1994)