%0 Journal Article %A Douglas J. Lucas %A John G. Lonski %T Changes in Corporate Credit Quality 1970–1990 %D 1992 %R 10.3905/jfi.1992.408031 %J The Journal of Fixed Income %P 7-14 %V 1 %N 4 %U https://jfi.pm-research.com/content/iijfixinc/1/4/7.full.pdf