@article{li_saydam_2016,  title={BALANCING AMBULANCE CREW WORKLOADS VIA A TIERED DISPATCH POLICY},  volume={36},  ISSN={0101-7438},  url={https://doi.org/10.1590/0101-7438.2016.036.03.0399},  DOI={10.1590/0101-7438.2016.036.03.0399},  number={3},  journal={Pesquisa Operacional},  publisher={Sociedade Brasileira de Pesquisa Operacional},  author={Li, Xun and Saydam, Cem},  year={2016},  month={Sep},  pages={399–419} }