@article {aksen2009design, title = {Design and analysis of government subsidized collection systems for incentive-dependent returns}, journal = {International Journal of Production Economics}, volume = {119}, number = {2}, year = {2009}, pages = {308{\textendash}327}, publisher = {Elsevier}, author = {Aksen, Deniz and Necati Aras and Karaarslan, Ay{\c s}e G{\"o}n{\"u}l} }