@article{martínez_alvarez-valdes_parreño_2015,  title={A GRASP ALGORITHM FOR THE CONTAINER LOADING PROBLEM WITH MULTI-DROP
                  CONSTRAINTS},  volume={35},  ISSN={0101-7438},  url={https://doi.org/10.1590/0101-7438.2015.035.01.0001},  DOI={10.1590/0101-7438.2015.035.01.0001},  number={1},  journal={Pesquisa Operacional},  publisher={Sociedade Brasileira de Pesquisa Operacional},  author={Martínez, D. Alvarez and Alvarez-Valdes, R. and Parreño, F.},  year={2015},  month={Jan},  pages={1–24} }