TY - JOUR T1 - EVALUATING HYPERMEDIA SYSTEMS JF - Human factors in computing systems: CHI'90 Conference proceedings, April 1-5, Seattle Y1 - 1990 A1 - Ehrlich,K. A1 - Microsytems,S. A1 - Marchionini,G. A1 - Nielsen,J. A1 - Shneiderman, Ben ER -