TY - CHAP A1 - Diaconescu, Ion-Mircea A1 - Lukichev, Sergey A1 - Giurca, Adrian T1 - Semantic Web and Rule Reasoning inside of E-Learning Systems Y1 - 2008 ER - TY - CHAP A1 - Lukichev, Sergey T1 - Defining a subset of OCL for expressing SWRL rules. Y1 - 2008 ER -