W. E. Hamilton, D. L. Dindal, C. M. Parkinson, M. J. Mitchell, Interaction of Earthworm Species in Sewage Sludge-Amended Soil Microcosms: Lumbricus terrestris and Eisenia fetida, Journal of Applied Ecology, Vol. 25, No. 3 (Dec., 1988), pp. 847-852
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Hamilton et al. (1988) studied this question.
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