1. Reidar Lien AIS, Øore Flatdsuei 10, N-7079 Flatas Norway;
2. Norsk Polarinstitutt, P. O. Box 188, N-1330 Oslo Lufthaun, Norway;
3. Continental Shelf and Petroleum Technology Research Institute Ltd., P. O. Box 1883, Jarlesletta, N-7001 Trondheim, Norway;