Ribeiro, V. Q., Silva, E. C. da, & Freire Filho, F. R. (2014). Size and shape of plots in experiments with sole and intercropped cowpea and maize crops. Pesquisa Agropecuaria Brasileira, 19(11), 1365–1371. https://doi.org/10.1590/S1678-3921.pab1984.v19.16177