Witteck, T. et al. (2004): Co-operative learning on the internet using the ball bearing method (Inside-Outside-Circle)

Witteck, T., Most, B., Leerhoff, G. & Eilks, I. (2004). Co-operative learning on the internet using the ball bearing method (Inside-Outside-Circle). Science Education International, 15(3), 209–223.@article{eilkswitteck2004c, title={Co-operative learning on the internet using the ball bearing method (Inside-Outside-Circle)}, author={Torsten Witteck and Most, Bettina and Leerhoff, Gabriele and Ingo Eilks}, year={2004}, journal={Science Education International}, volume={15}, number={3}, pages={209--223}, url={http://www.icaseonline.net/sei/september2004.htm} }