1. Adding coal ash to the composting mix;Beaver;Biocycle,1995
2. Composting Municipal Sludge: A Technology Evaluation;Benedict,1988
3. The biology of composting: a review;de Bertoldi;Waste Mngmt Res.,1983
4. Nitrogen transformations during sludge composting;Bishop;Biocycle,1983
5. Carbon/organic nitrogen ratio in water extract as measure of composting degradation;Chanyasak;J. Ferment. Techn.,1981