J. dos Santos Araújo, F. P. Fernandes, I. dos Santos Cabral, M. de Oliveira Maia Parente, H. N. Parente, and R. C. Rodrigues, “BIOGAS PRODUCTION FROM RUMINAL BIOMASS OF DIFFERENT GENETIC GROUPS OF SHEEP”, Int. J. Res. Granthaalayah, vol. 7, no. 8, pp. 126–132, Aug. 2019.