Y. Ding, Y. Du, Y. Hu, Z. Liu, L. Wang, K. Ross, and A. Ghose. Proceedings of the 2011 ACM SIGCOMM conference on Internet measurement conference, page 361--370. New York, NY, USA, ACM, (2011)
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>.