@book{198147,
	author = {Tikhomirov, V. M.},
	title = {Fundamental principles of the theory of extremal problems /},
	publisher = {Wiley,},
	year = {1986, c1982.},
	address = {Chichester ;},
	edition = {Licensed ed.},
	note = {Spine title: Theory of extremal problems.}
}