Before revision: <ref> Judd, Alan and Martin Hovland, 'Seabed Fluid Flow: The Impact on Geology, Biology and the Marine Environment, Cambridge University Press, 2007, </ref> Hovland, Martin, Seabed Pockmarks and Seepages : Geological Ecological and Environmental Implication, Springer, 1988, Discovery was aided by the use of high-resolution multibeam acoustic systems for bathymetric mapping.
After revision: Judd, Alan and Martin Hovland, 'Seabed Fluid Flow: The Impact on Geology, Biology and the Marine Environment, Cambridge University Press, 2007, '' Hovland, Martin, Seabed Pockmarks and Seepages : Geological Ecological and Environmental Implication, Springer, 1988, Discovery was aided by the use of high-resolution multibeam acoustic systems for bathymetric mapping.