http://doi.acm.org/10.1145/122974.123000 Catherine C. Marshall Frank G. Halasz Russell A. Rogers William C. Janssen Jr. Aquanet: A Hypertext Tool to Hold Your Knowledge in Place. 261-275 HT1991/P261.pdf 1991 conf/ht/91 Hypertext db/conf/ht/ht91.html#MarshallHRJ91