F. Perteneder, M. Bresler, E. Grossauer, J. Leong, C. Rendl, и M. Haller. Proceedings of the 19th ACM Conference on Computer Supported Cooperative Work and Social Computing Companion, стр. 81--85. New York, NY, USA, ACM, (2016)event-place: San Francisco, California, USA.
S. Moghaddam, и M. Ester. Proceedings of the 19th ACM international conference on Information and knowledge management, стр. 1825--1828. New York, NY, USA, ACM, (2010)