The need for academic middleware to support advanced learning services. - Michalis Konstantopoulos 002; Thomas Spyrou; John Darzentas (Comput. Networks, 2001)

Towards Integration of Learning Objects Metadata and Learner Profiles Design: Lessons Learnt from GESTALT. - Michalis Konstantopoulos 002; Jenny S. Darzentas; Panayiotis Koutsabasis; Thomas Spyrou; John Darzentas (Interact. Learn. Environ., 2001)

The construction of information infrastructures: context, view, applications, Η δόμηση των πληροφοριακών υποδομών: πλαίσιο, θεώρηση, εφαρμογές - Michalis Konstantopoulos 002 (2002)