RT Journal Article SR Electronic T1 The Capital Asset Pricing Model and the Market Model JF The Journal of Portfolio Management FD Institutional Investor Journals SP 5 OP 16 DO 10.3905/jpm.1981.408793 VO 7 IS 2 A1 Barr Rosenberg YR 1981 UL https://pm-research.com/content/7/2/5.abstract AB