D. F. de Andrade and A. Q. Noleto, “Examples of fractional replications (1/2)4³ e (1/4)44 for fitting quadratic polinomial models”, PAB, vol. 21, no. 6, pp. 677–680, Apr. 2014, doi: 10.1590/S1678-3921.pab1986.v21.14863.