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Bouché, M.B. and Al-Addan, F. and Cortez, J. and Hammed, R. and Heidet, J.-C. and Ferrière, G. and Mazaud, D. and Samih, M. (1997) Role of earthworms in the N cycle: A falsifiable assessment. Soil Biology and Biochemistry, 29 (3-4). pp. 375-380.