Paul H. Lewis Rob Wilkins Steve Griffiths Hugh C. Davis Wendy Hall Content based navigation in an open hypermedia environment. 921-929 1998 16 Image Vision Comput. 12-13 http://dx.doi.org/10.1016/S0262-8856(98)00057-2 db/journals/ivc/ivc16.html#LewisWGDH98