Dept. of Mathematics and Mathematical Physics Russia, 198904, St.-Petersburg, Staryj Peterhof, Uljanovskaja st., 1.

www.pdmi.ras.ru Steklov Mathematical Institute at St.Petersburg www.pdmi.ras.ru/EIMI/ Euler International Mathematical Institute www.pdmi.ras.ru/spbmo/ St.Petersburg Mathematical Society

Designed by valeev(c), 1999 http://valeev.da.ru mailto:valeev@mph.phys.spbu.ru