Filippa, G., Cremonese, E., Migliavacca, M., Galvagno, M., Sonnentag, O., Humphreys, E., Hufkens, K., Ryu, Y., Verfaillie,
J., di Cella, U. M., & Richardson, A. D. (2018). NDVI derived from near-infrared-enabled
digital cameras: Applicability across different plant functional types. Agricultural and Forest Meteorology,
249, 275-285. doi:10.1016/j.agrformet.2017.11.003.