@article{júnior_lopes_bergmann_2011, 
  title={A Free Geographic Information System as a Tool for Multi-Depot Vehicle Routing}, 
  DOI={10.4322/bjopm.2011.006}, 
  publisher={Associacao Brasileira de Engenharia de Producao - ABEPRO}, 
  author={Júnior and Lopes and Bergmann}, 
  year={2011}
  }