SMOS calibration and validation activities with airborne interferometric radiometer HUT-2D during spring 2010. - Juha Kainulainen; Kimmo Rautiainen; Pauli Sievinen; Jaakko Seppänen; Erkka Rouhe; Martti Hallikainen; Johanna T. Dall'Amico; Florian Schlenz; Alexander Loew; Alexander Bircher; Carsten Montzka (IGARSS, 2010)