@article{TUW-189394, author = {Wagner, Wolfgang}, title = {Radiometric calibration of small-footprint airborne laser scanner measurements: Basic physical concepts}, journal = {ISPRS Journal of Photogrammetry and Remote Sensing}, year = {2010}, volume = {65}, number = {10}, pages = {505--513}, doi = {10.1016/j.isprsjprs.2010.06.007} }