8Amir, E., and B. Lev. 1996. Value -relevance of Nonfinancial Information: The Wiretess Communications Indus- try. Journal of Accounting and Economics, 22 ( 1 ) : 3 - 30.
9Barth, M., W. Beaver, and W. Landsman. 1998. Relative Valuation Roles of Equity Book Value and Net Income as a Function of Financial Health. Journal of Accounting and E- conomics, 25 (1): 1-34.
10Behn, B. , and R. Riley. 1999. Using Nonfinancial In- formation to Predict Financial Performance : The Case of the US Airline Industry. Journal of Accounting, Auditing & Finance, 14 (1): 29-56.