@incollection{Fister2016Parameter,
  title={Parameterless Bat Algorithm and Its Performance Study},
  author={Fister Jr, Iztok and Mlakar, Uro{\v{s}} and Yang, Xin-She and Fister, Iztok},
  booktitle={Nature-Inspired Computation in Engineering},
  pages={267--276},
  year={2016},
  publisher={Springer}
}