CHOU, C.-Y., and S.-P. LU. “EVENLY MATCHED COMPETITIVE STRATEGIES: DYNAMIC DIFFICULTY ADAPTATION IN A GAME-BASED LEARNING SYSTEM”. Research and Practice in Technology Enhanced Learning, vol. 8, no. 2, Aug. 2022, pp. 225-43, https://rptel.apsce.net/index.php/RPTEL/article/view/2013-08015.