@article{ljs20125,
 author={Younes, M. and Khodja, F.},
 year={2012},
 title={A Hybrid Harmony Search Algorithm Approach for Optimal Power Flow},
 journal={Leonardo J. Sci.},
 volume={11},
 number={20},
 pages={125-144},
 url={http://ljs.academicdirect.org/A20/125_144.pdf}
}