RT Journal Article SR Electronic T1 Hidden Dangers in Modern Portfolio Theory JF The Journal of Portfolio Management FD Institutional Investor Journals SP 48 OP 51 DO 10.3905/jpm.1979.408685 VO 5 IS 3 A1 John P. Meehan A1 Ellen M. Hayes YR 1979 UL https://pm-research.com/content/5/3/48.abstract AB