RT Journal Article SR Electronic T1 Dilemmas in the Trends of Capital and Productivity JF The Journal of Portfolio Management FD Institutional Investor Journals SP 59 OP 64 DO 10.3905/jpm.1976.408574 VO 2 IS 4 A1 Leonall C. Andersen YR 1976 UL https://pm-research.com/content/2/4/59.abstract AB