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Astron. Astrophys. 356, 1089-1111 (2000) AcknowledgementsI would like to thank P. Barge and J. Sommeria for introducing me to this fascinating subject and for several illuminating comments. I acknowledge also very stimulating discussions with A. Provenzale, A. Bracco, P. Tanga and E. Spiegel. This work was initiated during my postdoctoral stay at the Istituto di Cosmogeofisica. Special thanks are due to E. Carena for her kind support. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: April 17, 2000 ![]() |