1. Stewart, S.: Video game industry silently taking over entertainment world, 22 October 2019. https://www.ejinsight.com/eji/article/id/2280405/20191022-video-game-industry-silently-taking-over-entertainment-world
2. Jeni, C.: Mobile gaming industry analysis & trends in 2020 (June 2019). https://medium.com/@christinaalex/mobile-gaming-industry-analysis-trends-in-2020-c2a1b2df86d6
3. O’Dea, S.: Smartphone users worldwide 2016–2021, 20 August 2020. https://www.statista.com/statistics/330695/number-of-smartphone-users-worldwide/
4. riki28: Networkunits: The decentralized multiplayer platform, 03 January 2018. https://medium.com/@pusinggg22/networkunits-the-decentralized-multiplayer-platform-a81261ce76a9
5. Al-Jaroodi, J., Mohamed, N.: Blockchain in industries: a survey. IEEE Access 7, 36500–36515 (2019). https://doi.org/10.1109/ACCESS.2019.2903554