1. Sources of biogenic methane in the Gulf of Mexico;Bernard,1980
2. Gas accumulations in the Paleocene sediments of Northeast Bulgaria;Chembersky;Geology and Mineral Resources,1995
3. Methane-bearing clays in the western half of the Black Sea;Chochov;Comptes rendus de l’Acad. Bulgare des Sciences,1987
4. Clayton, C.J., Dando, P.R., 1994. Comparison of seepage and seal leakage rates. Proceedings of the AAPG Hedberg Research Conference, 24–28 April, Vancouver, Canada, pp. 42–45.
5. Marine sediments as a source of atmospheric methane;Cranston;Bulletin of Geological Society of Denmark,1994