Rosa, Viviane Gomes Cardoso da, et al. “Coffee Crop Yield Estimate Using an agrometeorological‑spectral Model”. Pesquisa Agropecuaria Brasileira, vol. 45, no. 12, Feb. 2011, pp. 1478-14, doi:10.1590/S1678-3921.pab2010.v45.8623.