@InProceedings{Fister2013HybridBatAlgorithm,<br />
 author= {I.~Fister Jr.~and D.~Fister and X.-S.~Yang},<br />
 title={A Hybrid Bat Algorithm},<br />
 booktitle={Elektrotehni\v{s}ki vestnik}, <br />
 year={2013},<br />
 pages={1-7}}