Edward A. Fox Deborah Hix Lucy T. Nowell Dennis J. Brueni William C. Wake Lenwood S. Heath Durgesh Rao Users, User Interfaces, and Objects: Envision, a Digital Library. 480-491 1993 44 JASIS 8 db/journals/jasis/jasis44.html#FoxHNBWHR93 http://dx.doi.org/10.1002/(SICI)1097-4571(199309)44:8<480::AID-ASI7>3.0.CO;2-B