Celi-Parraga, R. J. . ., Varela-Tapia, E. A., Acosta-Guzmán, I. L. and Montaño-Pulzara, N. R. (2021) “Natural language processing techniques in textual conversational artificial intelligence”, AlfaPublicaciones, 3(4.1), pp. 40–52. doi: 10.33262/ap.v3i4.1.123.