RT Journal Article SR Electronic T1 Is the Equity Market Becoming More Volatile? JF The Journal of Portfolio Management FD Institutional Investor Journals SP 51 OP 54 DO 10.3905/jpm.1981.51 VO 7 IS 3 A1 Marvin McClay YR 1981 UL https://pm-research.com/content/7/3/51.abstract AB