Fraire Huacuja, Héctor J., Norberto Castillo-García, Rodolfo A. Pazos Rangel, José Antonio Martínez Flores, Juan Javier González Barbosa, and Juan Martín Carpio Valadez. 2015. “Two New Exact Methods for the Vertex Separation Problem”. International Journal of Combinatorial Optimization Problems and Informatics 6 (1):31-41. https://ijcopi.org/ojs/article/view/60.