Galvíncio, Josiclêda Domiciano, and Carine Rosa Naue. “Estimation of NDVI With Visible Images (RGB) Obtained With Drones”. Journal of Hyperspectral Remote Sensing, vol. 9, no. 6, Apr. 2020, pp. 407-20, doi:10.29150/jhrs.v9.6.p407-420.