- Collaboration and Technology, volume 6257/2010 of Lecture Notes in Computer Science, Springer, (2010)
- E-Infrastructures and Technologies for Lifelong Learning: Next Generation Environments, IGI Global, Hershey, PA, (2010)
- Informatics in Education-An International Journal 8(2):191-216 (2009)
- presented at the Symposium on the Occasion of the 100th Anniversary of ICMI, Rome, 5–8 March 2008, (2008)
- New Mathematics Education Research and Practice, Sense Publishers, Rotterdam, (2006)


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