@inproceedings{DiGRA-2015-ShibuyaTS,
	author        = "Akiko Shibuya and Mizuha Teramoto and Akiyo Shoun",
	booktitle     = "{Proceedings of the Ninth DiGRA International Conference: Diversity of Play}",
	ee            = "http://www.digra.org/digital-library/publications/systematic-analysis-of-in-game-purchases-and-social-features-of-mobile-social-games-in-japan/",
	publisher     = "{Digital Games Research Association}",
	title         = "{Systematic Analysis of In-Game Purchases and Social Features of Mobile Social Games in Japan}",
	year          = 2015,
}