Maurice Obstfeld, Jay C. Shambaugh and Alan M. Taylor, "The Trilemma in History: Tradeoffs Among Exchange Rates, Monetary Policies and Capital Mobility," Working Paper no. C04-133, Center for International and Development Economics Research, May 2004, http://129.3.20.41/eps/if/papers/0407/0407003.pdf(accessed: June 17, 2010)