@article{Osaba2018Discrete,
  title={A Discrete and Improved Bat Algorithm for solving a medical goods distribution problem with pharmacological waste collection},
  author={Osaba, Eneko and Yang, Xin-She and Fister Jr., Iztok and Del Ser, Javier and Lopez-Garcia, Pedro and Vazquez-Pardavila, Alejo J},
  journal={Swarm and Evolutionary Computation},
  year={2018}
}