1. Shallow gas: an overview;Davis,1992
2. Chimney cube unravels subsurface;Heggland;The American Oil and Gas Reporter,2000
3. Seabed Pockmarks and Seepages, Impact on Geology, Biology and the Marine Environment;Hovland,1988
4. Explaining the North Sea floor;McQuillin;New Scientist,1979
5. Identifying faults and gas chimneys using multiattributes and neural networks;Meldahl;The Leading Edge,2001