1. Kim J. -O. and I. Somiya: Jour of Japan Sewage Works Association, Vol. 35 (441) (1999), pp.101-109.
2. Ghosh M, A. Amirtharajah and A. AdinParticle: Wat. Sci. Tech., Vol. 30 (9) (1994), pp.209-218.
3. APHA, AWWA, WEF, Standard Methods for the Examination of Water and Wastewater (2007).
4. Patrick N. Johnson and A. Amirtharajah: Jour. of AWWA, (1983), pp.232-237.
5. Mark E. and Mark M. Benjamin.: Jour. of AWWA, (1991), pp.96-105.