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Jooyeon Yook and  Wonjun Ko,  Analysis on the Game-Playing Tendency of SNGs (Social Network Games) users by Gender.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 2107 - 2115[viewed 21 October 2017]. Available from: http://waset.org/publications/9607.