Marin, F.R. and Carvalho, G.L. de 2012. Spatio-temporal variability of sugarcane yield efficiency in the state of São Paulo, Brazil. Pesquisa Agropecuaria Brasileira. 47, 2 (Apr. 2012), 149–156. DOI:https://doi.org/10.1590/S1678-3921.pab2012.v47.9775.