R. P. Soratto, G. D. de Souza-Schlick, B. M. San Giacomo, M. D. Zanotto, and A. M. Fernandes, “Low‑height castor bean row spacing and plant population for mechanical harvest”, PAB, vol. 46, no. 3, pp. 245–253, Jun. 2011, doi: 10.1590/S1678-3921.pab2011.v46.9457.