Souza, José Gomes de, et al. “Use of Diploid Species of <i>gossypium< i> In Studies and Breeding of Tetraploid Cotton for Drought Resistance”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 2, Feb. 1991, pp. 289-95, doi:10.1590/S1678-3921.pab1991.v26.3341.