Garbuglio, D.D. et al. 2007. Factor analysis and bissegmented regression for studies about environmental stratification and maize adaptability. Pesquisa Agropecuaria Brasileira. 42, 2 (Feb. 2007), 183–191. DOI:https://doi.org/10.1590/S1678-3921.pab2007.v42.7553.