RT Journal Article SR Electronic T1 Nuggets JF The Journal of Portfolio Management FD Institutional Investor Journals SP 71 OP 77 DO 10.3905/jpm.1977.408594 VO 3 IS 2 A1 Fischer Black A1 Yale Hirsch A1 John Westergaard YR 1977 UL https://pm-research.com/content/3/2/71.abstract AB