Weinschenk, Philipp Max Planck Institute for Research on Collective Goods, Max Planck Society;
http://www.coll.mpg.de/pdf_dat/2010_38online.pdf (Preprint)
Herweg, F., Müller, D., & Weinschenk, P. (2010). Binary Payment Schemes: Moral Hazard and Loss Aversion.