1. Standard Methods for the Examination of Water and Wastewater;APHA,1985
2. Evaluation of anaerobic expanded bed contactors for municipal wastewater treatment;Brown,1985
3. Anaerobic contact process for sewage disposal;Coulter;Swge ind. Wastes,1957
4. The development of anaerobic wastewater treatment;Jewell,1985
5. Anaerobic sewage treatment;Jewell;Envir. Sci. Technol.,1987