Bergman, Stefan, 1898- Integral operators in the theory of linear partial differential equations. - Berlin: Springer, 1961. - 145 p.: illus., 24 cm. - Ergebnisse der Mathematik und ihrer Grenzgebiete; n.F., Heft 23 . Includes bibliography. LCCN: 61004651 /L Subjects--Topical Terms: Differential equations, Partial.Integrals. Dewey Class. No.: 515.35 / B499i