1. Bailey J.E. Ollis D.F. (1986) Fundamentals of biochemical engineering. McGraw-Hill New York.
2. Dictionary of scientific and technical terms (2002) 6th ed. Sybil P Parker Editor in Chief Mc-Graw Hill Book Company.
3. Grady C.P.L Daigger G.T. Lim H.C. (1999) Biological wastewater treatment. Marcel Dekker Inc. New York.
4. Kabay J. (1934) Hungarian invention patent no.10978.
5. Pretreatment of Afyon alcaloide factory's wastewater by wet air oxidation (WAO)