Maximilian Brell Luis Guanter Karl Segl Pysically Based Data Fusion Between Airborne Lidar and Hyperspectral Data: Geometric and Radiometric Synergies. 8865-8868 2018 IGARSS https://doi.org/10.1109/IGARSS.2018.8517682 conf/igarss/2018 db/conf/igarss/igarss2018.html#BrellGS18