1Fama E., French K., 2001. Disappearing dividends: changing firm characteristics or Iower propensity to Pay? Journal of Financial Economics 60, 3-43.
2Stephen A. Ross, Randolph W. Westerfield,Bfadford D. Jordan. 1998.Fundamentals of Corporate Finance, Fourth Edition. McFraw-Hill Book Co. and Dongbei University of Finance & Economics Press.