Michael Yudelson Peter Brusilovsky Vladimir Zadorozhny A User Modeling Server for Contemporary Adaptive Hypermedia: An Evaluation of the Push Approach to Evidence Propagation. 27-36 2007 conf/um/2007 User Modeling http://dx.doi.org/10.1007/978-3-540-73078-1_6 db/conf/um/um2007.html#YudelsonBZ07