Willem Buiter, “Can Central Banks Go Broke ?” , CEPR Policy Insight No.24, May 2008
"The Great Escape? A Quantitative Evaluation of the Fed’s Non-Standard Policies∗" Marco Del Negro, Gauti Eggertsson, Andrea Ferrero, Nobuhiro Kiyotaki December 2, 2009 http://www.frbsf.org/economics/conferences/1003/delnegro_eggertsson_ferrero_kiyotaki.pdf