Geochemistry of gas hydrate accumulation offshore NE Sakhalin Island (the Sea of Okhotsk): results from the KOMEX-2002 cruise - Matveeva, T.; Soloviev, V.; Wallmann, K.; Obzhirov, A.; Biebow, N.; Poort, J.; Salomatin, A.; Shoji, H. (Geo-Marine Letters, 2003)