@book{UBHD-69157377, title={Proceedings of the 9th international conference on Computer supported collaborative learning - Volume 1}, publisher={International Society of the Learning Sciences}, address={[Erscheinungsort nicht ermittelbar]}, year={2009}, pages={664 p.}, isbn={978-1-4092-8598-4}, series={DL Hosted proceedings}, doi={10.5555/1600053}, url={https://dl.acm.org/action/showBook?doi=10.5555/1600053}, library={UB}, }