@article{Bernanke1991,
	title = {Procyclical Labor Productivity and Competing Theories of the Business
	Cycle: Some Evidence from Interwar U.S. Manufacturing Industries},
	author = {Ben S. Bernanke and Martin L. Parkinson},
	day = {01},
	journal = {Journal of Political Economy},
	month = {Jan},
	note = {doi: 10.1086/261761},
	number = {3},
	pages = {439},
	url = {http://www.journals.uchicago.edu/doi/abs/10.1086/261761},
	volume = {99},
	year = {1991},
	biburl = {http://www.bibsonomy.org/bibtex/2bbb6febf5b0a65a2c48c6d1f77e546b3/smicha},
	keywords = {imported }
}