Jeff Conklin Albert M. Selvin Simon Buckingham Shum Maarten Sierhuis Facilitated hypertext for collective sensemaking: 15 years on from gIBIS. 123-124 2001 conf/ht/2001 Hypertext http://doi.acm.org/10.1145/504216.504246 db/conf/ht/ht2001.html#ConklinSSS01