Paul De Bra A. T. M. Aerts Bart Berden Barend de Lange Brendan Rousseau Tomi Santic David Smits Natalia Stash AHA! The adaptive hypermedia architecture. 81-84 2003 conf/ht/2003 Hypertext http://doi.acm.org/10.1145/900051.900068 db/conf/ht/ht2003.html#BraABLRSSS03