5Kae- Long Lin, Chung Yi Lin. Hydraltion Characteristics of Waste Sludge Ash Utilized as Raw Cement Material [J].Cement and Concrete Research, 2005.
6R.I. Maleka, Z.H. Khalilb, S.S. Imbabyb, D.M. Roy. The Contribution of Class -F fly Ash to the Strength of Cementitious Mixtures [J].Cement and Concrete Research, 2004.