RT Journal Article SR Electronic T1 Are Stock Markets Becoming Riskier JF The Journal of Portfolio Management FD Institutional Investor Journals SP 13 OP 19 DO 10.3905/jpm.1976.13 VO 2 IS 3 A1 Dennis E. Logue YR 1976 UL https://pm-research.com/content/2/3/13.abstract AB