@article {keskin2011lifetime,
	title = {Lifetime maximization in wireless sensor networks using a mobile sink with nonzero traveling time},
	journal = {The Computer Journal},
	year = {2011},
	pages = {bxr048},
	publisher = {Oxford University Press},
	author = {Keskin, M Emre and I. Kuban Altinel and Necati Aras and Ersoy, Cem}
}
