@article{Fister2016ParameterTuningPI,
  title={Parameter tuning of PI-controller with Bat algorithm},
  author={Fister, Dusan and Safari{\v{c}}, Riko and Fister Jr., Iztok and Fister, Iztok},
  journal={Informatica},
  volume={40},
  number={1},
  pages={109--116},
  year={2016}
}