da Silva Júnior, O., Lopes, L. A. and Bergmann, U. (2011) “A Free Geographic Information System as a Tool for Multi-Depot Vehicle Routing”, Brazilian Journal of Operations & Production Management, 8(1), pp. 103-120. Available at: https://bjopm.emnuvens.com.br/bjopm/article/view/V8N1A7 (Accessed: 22May2019).