Haim, P. G., Zoffoli, B. C., Zonta, E., & Araújo, A. P. (2012). Diagnosis of nitrogen nutrition in common bean leaves by digital image analysis. Pesquisa Agropecuaria Brasileira, 47(10), 1546–1549. https://doi.org/10.1590/S1678-3921.pab2012.v47.12354