@article {Aras2008a,
	title = {Locating collection centers for distance-and incentive-dependent returns},
	journal = {International Journal of Production Economics},
	volume = {111},
	number = {2},
	year = {2008},
	pages = {316{\textendash}333},
	publisher = {Elsevier},
	author = {Necati Aras and Aksen, Deniz}
}
