de Aquino, Adriana Maria, et al. “Earthworms (Oligochaeta) Reproduction in Manure and Sugar-Cane Bagasse”. Pesquisa Agropecuaria Brasileira, vol. 29, no. 2, Feb. 1994, pp. 161-8, doi:10.1590/S1678-3921.pab1994.v29.4040.