1. W. Roether, B. Klein, V. Beitzel, Institut für Umweltphysik, University of Bremen, 28344 Bremen, Germany.
2. B. B. Manca and V. Kovačević, Osservatorio Geofisico Sperimentale, 34016 Trieste, Italy.
3. D. Bregant and A. Luchetta, Istituto Talassografico di Trieste, 31123 Trieste, Italy.
4. D. Georgopoulos, National Centre for Marine Research, 16601 Hellinicon, Athens, Greece.