@ARTICLE{
author={Selmic Milica,Nikolic Milos Lj,Cupic Aleksandar M},
year={2020},
title={Postboxes Quantitative Optimization Model},
journal={SUSTAINABILITY},
volume={12},
number={5},
pages={-},
document_type={Article},
} 

@ARTICLE{
author={Cupic Aleksandar M,Teodorovic Dusan B},
year={2014},
title={A multi-objective approach to the parcel express service delivery problem},
journal={JOURNAL OF ADVANCED TRANSPORTATION},
volume={48},
number={7},
pages={701-720},
document_type={Article},
}