1. H. P. Echtler, M. Stiller, F. Steinhoff, C. Krawczyk, GeoForschungsZentrum, D-14473 Potsdam, Germany.
2. A. Suleimanov and V. Spiridonov, Spetsgeofisika, Moscow, 107140 Russia.
3. J. H. Knapp, Institute for the Study of the Continents, Cornell University, Ithaca, NY 14853, USA.
4. Y. Menshikov, Bazhenov Geophysical Expedition, Scheelite, 624051 Russia.
5. J. Alvarez-Marrón, Instituto de Ciencias de la Tierra, Consejo Superior de Investigaciones Cientificas-Barcelona, 08028 Spain.
6. N. Yunusov, Bashneftegeofizika, Ufa, 450000 Russia.