2003
The ADEPT Concept-Based Digital Learning Environment.
Proceedings of the Research and Advanced Technology for Digital Libraries, 2003

2002
Structured models of scientific concepts for organizing, accessing, and using learning materials.
Proceedings of the ACM/IEEE Joint Conference on Digital Libraries, 2002

2001
Digital library collaborations in a world community.
Proceedings of the ACM/IEEE Joint Conference on Digital Libraries, 2001