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The blue social bookmark and publication sharing system.
- the International Journal for Technology in Mathematics Education 13(2):65-78 (2006)
- Communications & Strategies, No. 1, p. 17, First Quarter 2007 (2007)
- Presence: Teleoperators \& Virtual Environments 8(3):247-263 (1999)
- Journal of Computer Assisted Learning 22(2):114-136 (2006)
- Lawrence Erlbaum Associates, Mahwah, NJ, (1996)
- Basic Books, New York, NY, (January 1981)
- Kluwer Academic, Dordrecht, (June 1996)
- Lawrence Erlbaum Associates, Mahwah, NJ, (1995)
- Massachusetts Institute of Technology, (1997)


