Hart, Oliver and John Moore (1988), "Incomplete Contracts and Renegotiation", Econometrica, Vol. 56, No. 4. (Jul.), pp. 755-785. [http://links.jstor.org/sici?sici=0012-9682%28198807%2956%3A4%3C755%3AICAR%3E2.0.CO%3B2-I link] [http://www.edegan.com/pdfs/Hart%20Moore%20(1988)%20-%20Incomplete%20Contracts%20and%20Renegotiation.pdf pdf]