Per-Olov Frölind Lars M. H. Ulander Digital elevation map generation using VHF-band SAR data in forested areas. 1769-1776 2002 40 IEEE T. Geoscience and Remote Sensing 8 http://dx.doi.org/10.1109/TGRS.2002.802461 db/journals/tgrs/tgrs40.html#FrolindU02