%0 Journal Article %A John M. Cheney %T Rating classification and bond yield volatility %D 1983 %R 10.3905/jpm.9.3.51 %J The Journal of Portfolio Management %P 51-57 %V 9 %N 3 %U https://jpm.pm-research.com/content/iijpormgmt/9/3/51.full.pdf