Petrov, Iu P. Variational methods in optimum control theory - New York : Academic Press, 1968 - 216 p. - Mathematicas in science and engineering ; 45 . - Mathematicas in science and engineering ; 45 . LCCN: 49092 Subjects--Topical Terms: Cálculo de variaciones. Dewey Class. No.: 517.4 / P4