Dixit, A., G. Grossman and E. Helpman (1997), Common Agency and Coordination: General Theory and Application to Government Policy Making, Journal of Political Economy 105, 752-69. [http://www.edegan.com/pdfs/Dixit%20Grossman%20Helpman%20(1997)%20-%20Common%20Agency%20and%20Coordination%20General%20Theory%20and%20Application%20to%20Government%20Policy%20Making.pdf pdf]