Syufagi, M.A., Hariadi, M. and Purnomo, M.H. 2013. A Cognitive Skill Classification Based on Multi Objective Optimization Using Learning Vector Quantization for Serious Games. Journal of ICT Research and Applications. 5, 3 (Sep. 2013), 185-202. DOI:https://doi.org/10.5614/itbj.ict.2011.5.3.3.