S. Pujari, A. Hadgu, E. Lex, and R. Jäschke. Proceedings of the 15th International Conference on Knowledge Technologies and Data-driven Business, New York, NY, USA, ACM, (2015)
M. Tedre, and J. Pajunen. Proceedings of the 13th Koli Calling International Conference on Computing Education Research, page 97--104. New York, NY, USA, ACM, (2013)
B. Garneli, M. Giannakos, K. Chorianopoulos, and L. Jaccheri. 4th International Conference on Serious Games Development and Applications (SGDA 2013), Trondheim, Norway on 25-27 September 2013., page 76--85. (2013)