Lefschetz, Solomon, 1884-1972. Differential equations; geometric theory/ Solomon Lefschetz. - New York: Interscience Publishers, 1957. - 364 p.: illus., 24 cm. - Pure and applied mathematics, v. 6. . - Pure and applied mathematics (Interscience Publishers) v. 6. . LCCN: 57009155 /L/r83 Nat. Bib. No.: GB58-2298 Subjects--Topical Terms: Differential equations.Topology. Dewey Class. No.: 515.35