@book{64131,
	author = {Worswick, G. D. N. and Royal Economic Society Great Britain},
	title = {The Concept and measurement of involuntary unemployment},
	publisher = {Allen and Unwin},
	year = {1976.},
	address = {London},
	note = {Papers delivered at a conference of the Royal Economic Society held at Durham in March 1974.}
}