Barros, Nelson Nogueira, et al. “Sheep Tolerance to Sodium Hydroxide and Or Residual Contents in the Broiler Litter”. Pesquisa Agropecuaria Brasileira, vol. 20, no. 4, Apr. 2014, pp. 487-95, doi:10.1590/S1678-3921.pab1985.v20.15303.