editorial note
| - Internet, lcauth.dra.com/lcauth [Library of Congress], 2004-02-05
- YIO 1993-1994. Encycl. of assoc. Int. org. 1994. LCNA (CD OCLC), 1993-12
- Water res. (Oxford), 1, 1992
- Secondary settling tanks : theory, modelling, design and operation/G Ekama, J Barnard, F Gunthert;international association on water quality, 1997
- Conference on biofilm systems : october 17-20, 1999, New York : program and proceedings/AWQ - International association on water quality, 1999
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