LUTHER, Joan E. - CARROLL, Allan L. Development of an index of balsam fir vigor by foliar spectral reflectance. In Remote Sens. Environ., 1999, vol. 69, s. 241-252Error: read handle in (rep.epca.fmtISO690).fmtXDatabaze. Dostupné na internete: <https://www.sciencedirect.com/science/article/pii/S0034425799000164>