Salle, Joseph La Stability by Liapunov's direct method : with applications / [by] Joseph La Salle and Solomon Lefschetz. - New York ; London : Academic Press, 1961 [Reprinted 1963] - ix, 134 p : ill. ; 24 cm. - vol. 4 Mathematics in science and engineering ; . Includes bibliography and index Subjects--Topical Terms: Stability.Differntial equations. Dewey Class. No.: 515.35 / SAS 1963