Investigation of a model inversion technique to estimate canopy biophysical variables from spectral and directional reflectance data Marie Weiss, Frédéric Baret, Ranga B. Myneni, Agnès Pragnère and Youri KnyazikhinAgronomie, 20 1 (2000) 3-22DOI: https://doi.org/10.1051/agro:2000105