P. Tandler, and L. Dietz. From Integrated Publication and Information Systems to Virtual Information and Knowledge Environments, 3379, page 241--250. Springer, (2005)
P. Dawabi, L. Dietz, A. Fernandez, and M. Wessner. International Conference on Computer Support for Collaborative Learning 2003 - Community Events, page 235--237. Bergen, Norway, (June 2003)