Ain Sume Magnus Gustafsson Magnus Herberthson Anna Jänis Stefan Nilsson Jonas Rahm Anders Örbom 2259-2267 2011 49 IEEE Trans. Geosci. Remote. Sens. 6-2 https://doi.org/10.1109/TGRS.2010.2096471 db/journals/tgrs/tgrs49.html#SumeGHJNRO11