@book{52250,
	author = {Los, Jerzy (Ed.) and Los, Maria W (Ed.)},
	title = {Mathematical models in economics},
	publisher = {North-Holland},
	year = {1974},
	address = {Amsterdam},
	note = {Symposium on Mathematical Methods of Economics (1972: Waraszawa)and Conference of Van Neumann Models (1972: Waraszawa)}
}