1. Mobile gaming benchmarks Q1 2018;Haslam,2018
2. AppBrain. 2019. Android and Google Play statistics.
3. Statista. 2018. Number of apps available in leading app stores as of 1st quarter 2018.
4. Advertising, learning, and consumer choice in experience good markets: An empirical examination;Ackerberg;International Economic Review,2003
5. The implications of offering free versions for the performance of paid mobile apps;Arora;J. Marketing,2017