P. Kluegl, M. Toepfer, F. Lemmerich, A. Hotho, and F. Puppe. Mathematical Methodologies in Pattern Recognition and Machine Learning Springer Proceedings in Mathematics & Statistics, (2013)
P. Ellerani, and M. Mendoza. Procedia - Social and Behavioral Sciences, 83 (0):
659 - 666(2013)2nd World Conference on Educational Technology Research.