Brad Johnson
| Johnson, B. and Greenberg, S. (1999) Judging People's Availability for Interaction from Video Snapshots. In Proceedings of the Hawaii International Conference on System Sciences. (Distributed Group Support Systems Minitrack), IEEE Press, January. Earlier version as Report 1998-616-07. | 
| |
| Greenberg, S. and Johnson, B. (1997) Studying Awareness in Contact Facilitation. In ACM CHI'97 Workshop on Awareness in Collaborative Systems. (Atlanta, Georgia), (Susan E. McDaniel and Tom Brinck, Ed.), March 22-27. |
| |