Chiliński, Michał T., and Marek Ostrowski. “Comparison of the Results of Modified NDVI Indicator Established on the Basis of Measurements by Hyperspectral Spectrometer and Digital Camera”. Ecological Questions 17 (July 19, 2013): 35 –. Accessed July 18, 2024. https://apcz.umk.pl/EQ/article/view/ecoq-2013-0014.