Analysis of the Sources of Variation in L-band Backscatter From Terrains With Permafrost. - Manabu Watanabe; Gaku Kadosaki; Yongwon Kim; Mamoru Ishikawa; Keiji Kushida; Yuki Sawada; Takeo Tadono; Masami Fukuda; Motoyuki Sato (IEEE Trans. Geosci. Remote. Sens., 2012)