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Witteck, T. & Eilks, I. (2006). Open experimentation and problem solving in a cooperative learning company. School Science Review June, 88(323), 95–102.@article{eilkswitteck2006d, title={Open experimentation and problem solving in a cooperative learning company}, author={Torsten Witteck and Ingo Eilks}, year={2006}, journal={School Science Review June}, volume={88}, number={323}, pages={95--102} }