@book{11483,
	author = {Symposium on Calculus of Variations and Control Theory, Mathematics Research Centre, Univ. of Wisconsin-Madison, Sept. 22-24, 1975 and Russell, David L.},
	title = {Calculus of variations and control theory; proceedings},
	publisher = {Academic Press,},
	year = {1976},
	address = {New York:}
}