RT Journal Article SR Electronic T1 Are GNMAs a Good Investment JF The Journal of Portfolio Management FD Institutional Investor Journals SP 49 OP 52 DO 10.3905/jpm.1978.49 VO 5 IS 1 A1 Richard L. Norgaard YR 1978 UL https://pm-research.com/content/5/1/49.abstract AB