u-Annotate: An Application for User-Driven Freeform Digital Ink Annotation of E-Learning Content. - Mohamed Amine Chatti; Tim Sodhi; Marcus Specht; Ralf Klamma; Roland Klemke (ICALT, 2006)

Bridging the Gap between Practitioners and E-Learning Standards: A Domain-Specific Modeling Approach. - Yongwu Miao; Tim Sodhi; Francis Brouns; Peter B. Sloep; Rob Koper (EC-TEL, 2008)