Díaz-Parra, Ocotlán, Jorge Alberto Ruiz Vanoye, Alejandro Fuentes-Penna, Beatriz Bernabe Loranca, Joaquín Pérez-Ortega, Ricardo A. Barrera-Cámara, Daniel Vélez-Díaz, and Nubia B. Pérez-Olguin. “Oil Platform Transport Problem (OPTP) Is NP-Hard”. International Journal of Combinatorial Optimization Problems and Informatics 8, no. 3 (January 9, 2018): 2–19. Accessed March 29, 2024. https://ijcopi.org/ojs/article/view/14.