Dear Mikhail,

Here are a few:

Alha, K., Koskinen, E., Paavilainen, J., Hamari, J., & Kinnunen, J. (2014). Free-to-Play Games: Professionals’ Perspectives. In Proceedings of Nordic Digra 2014, Gotland, Sweden, May 29, 2014.

Hamari, J. (2011). Perspectives from behavioral economics to analyzing game design patterns: loss aversion in social games. CHI’2011 (Social games workshop), Vancouver, Canada, May 7-12, 2011. Social games workshop.

Hamari, J. (2015). Why Do People Buy Virtual Goods? Attitude towards Virtual Good Purchases versus Game Enjoyment. International Journal of Information Management, 35. DOI: 10.1016/j.ijinfomgt.2015.01.007

Hamari, J., & Järvinen, A. (2011). Building Customer Relationship through Game Mechanics in Social Games. In M. Cruz-Cunha, V. Carvalho & P. Tavares (Eds.), Business, Technological and Social Dimensions of Computer Games: Multidisciplinary Developments. Hershey, PA: IGI Global.

Hamari, J., Keronen, L., & Alha, K. (2015). Why do people play games. A review of empirical studies on game adoption and use. In proceedings of the 48th Annual Hawaii International Conference on System Sciences (HICSS), Hawaii, USA.

Hamari, J., & Lehdonvirta, V. (2010). Game design as marketing: How game mechanics create demand for virtual goods. International Journal of Business Science & Applied Management, 5(1), 14-29.

Hanner, N., & Zarnekow, R. (2015). Purchasing Behavior in Free to Play Games: Concepts and Empirical Validation. In proceedings of the 48th Annual Hawaii International Conference on System Sciences (HICSS), Hawaii, USA.

Lin, H., & Sun, T-C. (2011). Cash Trade in Free-to-Play Online Games. Games and Culture, 6(3), 270-287.

Paavilainen, J., Hamari, J., Stenros, J., & Kinnunen, J. (2013). Social Network Games: Players’ Perspectives. Simulation & Gaming, 44 (6), 794-820.

Tyni, H., Sotamaa, O., & Toivonen, S. (2011). Howdy pardner!: on free-to-play, sociability and rhythm design in FrontierVille. In Proceedings of the 15th International Academic MindTrek Conference: Envisioning Future Media Environments (pp. 22-29). ACM.

Best regards.

Dear Jugo,

Thanks a lot for so detailed answer!

Thank you!

Hello Mikhail, nice shot, looks like it would be difficult to find better answer than Juho provided :) Greeting for Juho as well, hope you are close to the next nice paper related to gamification and surrounding areas. Best, JJ

Thanks JJ. Nice to hear from you!

https://www.researchgate.net/publication/358008606_Customers'_Retention_on_Freemium_Platforms_-_An_Empirical_Analysis_of_the_Factors_Influencing_the_Termination_Rate