00274nam a2200109Ia 4500082001900000100002100019245006800040260003100108300001500139500000500154700000500159  a332.6bM346.PS  aMarkowitz, H. M.  aPortfolio selection; efficient diversification of investmentsb  aNew YorkbJohn Wileyc1959  axii, 344p.  a  a