B. Sigurbjörnsson, and R. van Zwol. WWW '08: Proceeding of the 17th International Conference on World Wide Web, page 327--336. New York, NY, USA, ACM, (2008)
M. Budde, R. El Masri, T. Riedel, and M. Beigl. Proceedings of the 12th International Conference on Mobile and Ubiquitous Multimedia, page 19. ACM, (2013)
O. Saukh, D. Hasenfratz, and L. Thiele. Proceedings of the 14th International Conference on Information Processing in Sensor Networks, page 274--285. ACM, (2015)
A. Liddo, and S. Shum. ACM Computer Supported Cooperative Work (CSCW 2010) - Workshop: Collective Intelligence In Organizations - Toward a Research Agenda, (February 2010)