Portfolio Selection, Efficient Diversification of Investments, par HARRY-M. MARKOWITZ. (Cowles Foundation for Research in Economics at Yale University, Monograph 16). Un vol., 6 po. x 9¼, relié, 344 pages — JOHN WILEY & SONS, INC., 440, 4e avenue, New-York 16, N.Y., 1959 (7.50) - Durand, Georges (L'Actualité économique, 1961)