Caeiro, M., Fontenla, J., Mikic, F., Perez, R., Llamas, M., & Burguillo, J. C. (2011). A SOA-based Middleware to Integrate Chatterbots in e-Learning Systems. Cadernos De Informática, 6(1), 163–170. Recuperado de https://seer.ufrgs.br/index.php/cadernosdeinformatica/article/view/v6n1p163-170