1. APHA (1985) Standard Methods for the Examination of Water and Wastewater, 16th edition. APHA, Washington, DC
2. Atkinson B., Davies I. and How S. (1974) The overall rate of substrate uptake by microbial films, Parts I and II. Trans. Inst. Chem. Eng.
3. Metcalf and Eddy (1991) Wastewater Engineering. McGraw-Hill, New York
4. Shroeder E. (1977) Water and Wastewater Treatment. McGraw-Hill, New York
5. Tyagi R. and Vembu K. (1990) Wastewater Treatment by Immobilized Cells. CRC, Boca Raton