Elton, Edwin J. Modern portfolio theory and investment analysis / Edwin J. Elton, Martin J. Gruber. - 4th ed. - Singapore : Wiley, c1991. - xvi, 736 p. : ill. ; 22 cm. - The Wiley series in finance . Includes bibliographical references and index. ISBN: 9971511436 Subjects--Topical Terms: Portfolio managementInvestments analysis LC Class. No.: HG4529.5 / El8 1991