RT Journal Article SR Electronic T1 Are Financial Ratios Worth the Effort? JF The Journal of Portfolio Management FD Institutional Investor Journals SP 51 OP 54 DO 10.3905/jpm.1975.51 VO 2 IS 1 A1 Donald M. Peterson YR 1975 UL https://pm-research.com/content/2/1/51.abstract AB