Cordes, Heinz Otto 1925- Spectral theory of linear differential operators and comparison algebras/ H. O. Cordes. - Cambridge, UK New York: Cambridge University Press, 1987. - ix, 342 p.: ill.; 23 cm. - London Mathematical Society lecture note series; 76. . Includes index. Bibliography: p. [328]-339. ISBN: 0521284430 (pbk.) LCCN: 85047935 Nat. Bib. No.: GB85-29719 Subjects--Topical Terms: Differential operators.Linear operators. Dewey Class. No.: 515.7242 / C794s