Smirnov, V. I. A course of higher mathematics. Vol.4 : integral educations and partial differential equations / by Smirnov, V. I. ; Brown, D. E. ; Snedd, I.N. - Oxford Pergamon Press 1964 - xiii, 814p. - International series of monographs in Pure and Applied Mathematics . SR Dewey Class. No.: 517.8 / S