%0 Journal Article %A Robert B Litterman %A Thomas Iben %T Corporate bond valuation and the term structure of credit spreads %D 1991 %R 10.3905/jpm.1991.409331 %J The Journal of Portfolio Management %P 52-64 %V 17 %N 3 %U https://jpm.pm-research.com/content/iijpormgmt/17/3/52.full.pdf