Comparison of neutral outgassing of comet 67P/Churyumov-Gerasimenko inbound and outbound beyond 3 AU from ROSINA/DFMS - Luspay-Kuti, A; Altwegg, K; Berthelier, JJ; Beth, A; Dhooghe, F; Fiethe, B; Fuselier, SA; Gombosi, T; Hansen, KC; Hassig, M; Livadiotis, G; Mall, U; et al. (ASTRONOMY & ASTROPHYSICS, 2019)