Díaz-Parra, O., Ruiz Vanoye, J. A., Fuentes-Penna, A., Bernabe Loranca, B., Pérez-Ortega, J., Barrera-Cámara, R. A., Vélez-Díaz, D. and Pérez-Olguin, N. B. (2018) “Oil Platform Transport Problem (OPTP) is NP-hard”, International Journal of Combinatorial Optimization Problems and Informatics, 8(3), pp. 2-19. Available at: https://ijcopi.org/ojs/article/view/14 (Accessed: 18June2021).