Martinez-Quezada, M. . E., . J. . P. Sánchez-Solís, . G. Rivera, R. . Florencia, and F. López-Orozco. “English Mispronunciation Detection Module Using a Transformer Network Integrated into a Chatbot”. International Journal of Combinatorial Optimization Problems and Informatics, vol. 13, no. 2, Aug. 2022, pp. 65-75, https://www.ijcopi.org/ojs/article/view/268.