E. Bakshy, J. Hofman, W. Mason, and D. Watts. Proceedings of the Fourth ACM International Conference on Web Search and Data Mining, page 65--74. New York, NY, USA, ACM, (2011)
B. Keegan, D. Gergle, and N. Contractor. Proceedings of the ACM 2012 conference on Computer Supported Cooperative Work, page 427--436. New York, NY, USA, ACM, (2012)
C. Ross, E. Orr, M. Sisic, J. Arseneault, M. Simmering, and R. Orr. Computers in Human Behavior, 25 (2):
578 - 586(2009)<ce:title>Including the Special Issue: State of the Art Research into Cognitive Load Theory</ce:title>.
J. Kunegis, A. Lommatzsch, and C. Bauckhage. Proceedings of the 18th international conference on World wide web, page 741--750. New York, NY, USA, ACM, (2009)