RT Journal Article SR Electronic T1 How do Call Provisions Influence Bond Yields? JF The Journal of Portfolio Management FD Institutional Investor Journals SP 70 OP 71 DO 10.3905/jpm.1979.70 VO 5 IS 4 A1 Gene Laber YR 1979 UL https://pm-research.com/content/5/4/70.abstract AB