db/conf/ht/GronbaekHMS93.html Kaj Grønbæk Jens A. Hem Ole Lehrmann Madsen Lennert Sloth Designing Dexter-Based Cooperative Hypermedia Systems. 25-38 HT1993/P025.pdf 1993 conf/ht/93 Hypertext db/conf/ht/ht93.html#GronbaekHMS93