1. Implementing the Coupled Objects Paradigm for Synchronizing Distributed Applications Through Firewalls
2. Activity Theory
3. Bollen, L., Hoppe, H. U., Milrad, M. and Pinkwart, N. Collaborative modelling in group learning environments. XX International Conference of the System Dynamics Society. July2002, Palermo, Italy. Retrieved November 15, 2008, fromhttp://www.systemdynamics.org/conferences/2002/papers/Bollen1.pdf