Bérard, Pierre H. Spectral geometry: direct and inverse problems/ by Pierre H. Bérard. - Rio de Janeiro: IMPA, [1986]. - viii, 271 p.: ill.; 23 cm. - Monografias de matemática; no. 41. . - Monografias de Matemática (IMPA); no. 41. . Includes bibliographies and index. ISBN: 8524400277 Subjects--Topical Terms: Geometry, Riemannian.Eigenvalues.Operator theory. Dewey Class. No.: 516 / B483s