da Silva Júnior, O., L. A. Lopes, and U. Bergmann. “A Free Geographic Information System As a Tool for Multi-Depot Vehicle Routing”. Brazilian Journal of Operations & Production Management, Vol. 8, no. 1, Dec. 2011, pp. 103-20, https://bjopm.emnuvens.com.br/bjopm/article/view/V8N1A7.