%0 Journal Article %A Michael G. Ferri %A Charles G. Martin %T The cyclical pattern in corporate bond quality %D 1980 %R 10.3905/jpm.1980.408736 %J The Journal of Portfolio Management %P 26-29 %V 6 %N 2 %U https://jpm.pm-research.com/content/iijpormgmt/6/2/26.full.pdf