@article {13988334,
	title = {{Efficient integer programming formulations for optimum sink location and routing in heterogeneous wireless sensor networks}},
	journal = {Computer Networks},
	volume = {54},
	year = {2010},
	pages = {1805{\textendash}1822},
	doi = {10.1016/j.comnet.2010.02.009},
	author = {Evren G{\"u}ney and Necati Aras and I. Kuban Altinel and Cem Ersoy}
}
