González, Juan J., Rogelio Florencia-Juarez, Héctor J. Fraire, Rodolfo A. Pazos Rangel, Laura Cruz-Reyes, and Claudia Gómez. 2015. “Semantic Representations for Knowledge Modelling of a Natural Language Interface to Databases Using Ontologies”. International Journal of Combinatorial Optimization Problems and Informatics 6 (2):28-42. https://ijcopi.org/ojs/article/view/54.