H. Sharma, Z. Toups, A. Jain, and A. Kerne. Proceedings of the 2015 Annual Symposium on Computer-Human Interaction in Play, page 691--696. New York, NY, USA, ACM, (2015)
K. Becker, G. Stumme, R. Wille, U. Wille, and M. Zickwolff. Knowledge Engineering and Knowledge Management. Methods, Models, and Tools., volume 1937 of LNAI, page 352-365. Heidelberg, Springer, (2000)
G. Stumme, and K. Wolff. Advances in Database Technologies. Proc. Intl. Workshop on Data Warehousing and, volume 1552 of LNCS, page 117-128. Heidelberg, Springer, (1999)