J. A. Bamidele, I. Adewunmi B., A. Kehinde O., and A. Adijat O., “Microbial diversity and digestive enzyme activities in the gut of earthworms found in sawmill industries in Abeokuta, Nigeria”, Rev. Biol. Trop., vol. 62, no. 3, pp. 1241–1249, Sep. 2014.