Pol, Balthasar van der, 1889-1959. Operational calculus based on the two-sided Laplace integral/ by Balth. van der Pol and H. Bremmer. - [2d ed.] - Cambridge, UK: University Press, 1955. - 415 p.: illus., 26 cm. LCCN: 55012941 /L Nat. Bib. No.: GB55-12228 Subjects--Topical Terms: Calculus, Operational. Dewey Class. No.: 515 / P762o