Dutta, D., M. Sen, and B. Singha. “Multi-Item Multi-Objective Fixed Charged Solid Transportation Problem With Type-2 Fuzzy Variables”. Proyecciones (Antofagasta, On Line), vol. 39, no. 3, June 2020, pp. 621-37, doi:10.22199/issn.0717-6279-2020-03-0038.