Gerhard Knorz Hypertext - Information Retrieval - Multimedia '97. 75-80 1998 15 LDV Forum 1 http://ariadne.coli.uni-bielefeld.de/gldv/site/1998_Heft1/75-80_Knorz_c.pdf db/journals/ldvf/ldvf15.html#Knorz98a