@book{3612,
	author = {Aiginger, Karl and Pfaffermayr, Michael},
	title = {Product Quality, Cost Asymetry and the Welfare Loss of  Oligopoly},
	publisher = {Österreichisches Institut für Wirtschaftsforschung (WIFO),},
	year = {1994.},
	series = {WIFO Working Papers},
	address = {Wien :}
}