Lira, Mário de Andrade, et al. “Behavior of New Forage Sorghum Progenies for the Semi-Arid Region of Pernambuco, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 23, no. 11, Apr. 2014, pp. 1239-46, doi:10.1590/S1678-3921.pab1988.v23.14080.