1. Articles: Characteristics of Effluent and Sludge from Two Commercial Rainbow Trout Farms in Minnesota
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3. Blake, J., Donald, J. and Magette, W., eds. National livestock, poultry and aquaculture waste management. Proceedings of the national workshop. Michigan: American Society of Agricultural Engineers, St. Joseph.
4. EIFAC (European Inland Fisheries Advisory Commission) Technical Paper 41;Butz I.,1982