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Schindler-Wessels, M., Patrick J. Bohlen, D.A. McCartney, and C.A. Edwards. 1997. “The Effect of Earthworms on Soil Respiration in Corn Agroecosystems With Different Nutrient Treatments”. Soil Biol. Biochem. 29: 409-12.
Edwards, C.A., and Patrick Bohlen. 1996. Biology and Ecology of Earthworms. 3rd ed. Chapman & Hall, Inc., London.
Bohlen, Patrick J., R.W. Parmelee, J.M. Blair, C.A. Edwards, and B.R. Stinner. 1995. “Efficacy of Methods for Manipulating Earthworm Populations in Large-Scale Field Experiments in Agroecosystems”. Soil Biol. Biochem. 27: 993-99.