Andrade, Dalton F. de, and Antonio Q. Noleto. 2014. “Examples of Fractional Replications (1 2)4³ E (1 4)44 for Fitting Quadratic Polinomial Models”. Pesquisa Agropecuaria Brasileira 21 (6):677-80. https://doi.org/10.1590/S1678-3921.pab1986.v21.14863.