Vania Dimitrova Kalina Bontcheva The Use of Conceptual Graphs for Interactive Student Modelling and Adaptive Web Explanations. 230-237 http://dx.doi.org/10.1007/978-3-540-45226-3_32 2003 conf/kes/2003-2 KES db/conf/kes/kes2003-2.html#DimitrovaB03