4Altman. 1983. Corporate Financial Distress. New York: Wiley (1983).
5Avramov, G. Jostova, & A. Philipov. 2007. Understanding Changes in Corporate Credit Spreads. Financial Analysts Journal, 63 (2): 90 - 105.
6Dbouk & Kryzanowski. 2010. Determinants of Credit Spread Changes. Studies in Economics and Finance, 27 (1:) 67 -82.
7Duffee. 1998. The Relation Between Treasury Yields and Corporate Bond Yield Spreads. The Journal of Finance, 53 (6) : 2225 - 2241.
8Dragon, Yongjun Tang & Hong Yah. 2005. Microeconmic Conditions, Firm characteristics, and Credit Spreads. Fina Serv Res, 29 (3): 177-210.
9Guha & Hiris. 2002. The Aggregate Credit Spread and The Business Cycle. International Review of Financial Analysis, 11 : 219 -227.
10Jonathan & H. Wright. 2011. Term Premiums and Inflation Uncertainty: Empirical Evidence from an International Panel Dataset. The American Economic Review, 101 (4) : 1514 - 1534.