7Black, F. and Scholes, M., The pricing of op- tions and corporate liabilities. Journal Of Political Economy, Vol.81, No.10, 1973.
8Claus, J. and Thomas, J., Equity premium as low as three percent? Evidence from analysts' earn- ings forecasts for domestic and international stock markets. Journal Of Finance, Vol.23, No.5,2001.
9Duffle, D. and Singleton, K., Modeling term structures of defaultable bonds. Review Of Financial Studies, Vol.17, No.12,1999.
10Fujita, M. and Krugman, P., On the evolu- tion of hierarchical urban systems. European Eco- nomic Review, Vol.43, No. 1,1999.
