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V. Kalnikait\.e, P. Ehlen, und S. Whittaker. Proceedings of the ACM 2012 conference on Computer Supported Cooperative Work, Seite 349--358. New York, NY, USA, ACM, (2012)
P. Ehlen, und M. Johnston. Proceedings of the 16th international conference on Intelligent user interfaces, Seite 435--436. New York, NY, USA, ACM, (2011)
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P. Ehlen, R. Zajac, und K. Rao. Proceedings of the Second International Workshop on Location and the Web (LocWeb 2009), Seite 17-19. Boston, Massachusetts, (April 2009)
J. Linebarger, A. Scholand, M. Ehlen, und M. Procopio. GROUP '05: Proceedings of the 2005 international ACM SIGGROUP conference on Supporting group work, Seite 51--60. New York, NY, USA, ACM Press, (2005)