1. Burnett, W. E. (1974). The effect of salinity variations on the activated sludge process. Water Sewage Works, 121(37-38), 54–55.
2. Curds, C. (1982). The ecology and role of protozoa in aerobic sewage treatment processes. Annual Review of Microbiology, 36, 27–46.
3. Czech Standards Institute (1999a). Characterization of sludge—determination of pH-value. ČSN EN 12 176.
4. Czech Standards Institute (1999b). Water quality—determination of biochemical oxygen demand after n days (BODn)—part 2: method for undiluted samples. ČSN EN 1899-2.
5. Czech Standards Institute (2002). Water quality—determination of chloride by flow analysis (CFA and FIA) and photometric or potentiometric detection. ČSN EN ISO 15682.