Churchill, Ruel V. Fourier series and boundary value problems / Ruel V. Churchill. - 1st ed. - London : McGraw-Hill book company, Inc., c 1941. - ix, 206 p. : ill. ; 24 cm. Includes index. 392 392 Subjects--Topical Terms: Fourier series.Functions, Orthogonal. Dewey Class. No.: 517.2 / C473f