@article{Fister2016ParameterTuningPI,<br />
 author= {D.~Fister and R.~Safari\v{c} and I.~Fister Jr.~and I.~Fister},<br />
 title={Parameter tuning of PI-controller with Bat algorithm},<br />
 journal={Informatica}, <br />
 year={2016},<br />
 volume={40},<br />
 pages={109--116}}