RT Journal Article SR Electronic T1 A new approach to ratings on utility bonds JF The Journal of Portfolio Management FD Institutional Investor Journals SP 71 OP 72 DO 10.3905/jpm.1980.408756 VO 6 IS 4 A1 George W. Gallinger YR 1980 UL https://pm-research.com/content/6/4/71.abstract AB