@article {3338,
	title = {Application of Grey Wolf Optimizer Algorithm for Optimal Power Flow of Two-Terminal HVDC Transmission System},
	journal = {Advances in Electrical and Electronic Engineering},
	volume = {15},
	number = {5},
	year = {2017},
	pages = {701-712},
	author = {H.A. Hassan and M. Zellagui}
}
