Possible variation in methane flux caused by gas hydrate formation on the northeastern continental slope off Sakhalin Island, Russia - Minami, Hirotsugu; Tatsumi, Kazuya; Hachikubo, Akihiro; Yamashita, Satoshi; Sakagami, Hirotoshi; Takahashi, Nobuo; Shoji, Hitoshi; Jin, Young Keun; Obzhirov, Anatoly; Nikolaeva, Nataliya; Derkachev, Alexander (Geo-Marine Letters, 2012)