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Collins, Robert O., ed.
O.P., Robert Edward Brennan
O'CONNOR, Robert E.
Osiander, Robert. ed.
Parmley, Robert O., ed.
Tilman, Robert O., ed.
New Orleans, April 27-May 2, 1991. sponsored by the Association for computing Machinery's special interest group on Computer-Human interaction: edited by Scott P. Robertson, Gary M.Olson, Judith S.Olson.