RT Journal Article SR Electronic T1 A New Route to Higher Returns and Lower Risks JF The Journal of Portfolio Management FD Institutional Investor Journals SP 30 OP 38 DO 10.3905/jpm.1975.408545 VO 2 IS 1 A1 Gary L. Bergstrom YR 1975 UL https://pm-research.com/content/2/1/30.abstract AB