@book{1927,
	author = {Shigan, E.N. and IIASA Workshop on Modeling Health Care Systems (1977 : Laxenburg, Austria).},
	title = {Modeling health care systems : proceedings [of the] Workshop, Laxenburg, Austria, 28-29 March 1977.},
	publisher = {International Institute for Applied Systems Analysis,},
	year = {1977.},
	address = {Austria : }
}