Franzolin Neto, Raul, et al. “Effects of Diets With Varying Protein Levels on Rumen Ciliate Protozoa in Buffaloes (<i>Bubalus bubalis< I> L.)”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 4, Apr. 1991, pp. 487-93, doi:10.1590/S1678-3921.pab1991.v26.3367.