Water vapor in Titan's stratosphere from Cassini CIRS far-infrared spectra - Cottini, V; Nixon, C; Jennings, D; Anderson, C; Gorius, N; Bjoraker, G; Coustenis, A; Teanby, N; Achterberg, R; Bezard, B; de Kok, R; Lellouch, E; et al. (ICARUS, 2012)