Ground-truthing 11- to 12-kHz side-scan sonar imagery in the Norwegia-Greenland Sea: Part I: Pockmarks on the Vestnesa Ridge and Storegga slide margin - Vogt, P. R.; Gardner, J.; Crane, K.; Sundvor, E.; Bowles, F.; Cherkashev, G. (Geo-Marine Letters, 1999)