Syufagi, Moh. Aries, Mochamad Hariadi, and Mauridhi Hery Purnomo. 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):185-202. https://doi.org/10.5614/itbj.ict.2011.5.3.3.