M. . E. Martinez-Quezada, . J. . P. Sánchez-Solís, . G. Rivera, R. . Florencia, and F. López-Orozco, “English mispronunciation detection module using a Transformer network integrated into a chatbot”, Int. Journal of COP and Infor., vol. 13, no. 2, pp. 65–75, Aug. 2022.