[47]  We thank T. Ya. Tudorovskiy for useful discussion and the help in preparation of the pictures. This work was supported by the Russian Basic Research Foundation under grant RBRF-05-01-00968 and the scientific agreement among the Department of Physics of the University of Rome "La Sapienza" and the Institute for Problems in Mechanics of Russian Academy of Sciences, Moscow.


Powered by TeXWeb (Win32, v.2.0).