∈L PROCEEDINGS OF THE STEKLOV INSTITUTE OF MATHEMATICS Vol. / Steklov Institute of Mathematics / PROCEEDINGS OF THE STEKLOV INSTITUTE OF MATHEMATICS Vol. / Nikitin PROCEEDINGS OF THE STEKLOV INSTITUTE OF MATHEMATICS Vol. / /
Steklov Institute of Mathematics / Russian Academy of Sciences / Oxford Univ. / STEKLOV INSTITUTE OF MATHEMATICS Vol. / J. Assoc. / Khabarovsk Division / Dynasty Foundation / Russian Foundation for Basic Research / Institute of Applied Mathematics / /
c Pleiades Publishing, Ltd., 2012. ISSN, Proceedings of the Steklov Institute of Mathematics, 2012, Vol. 276, pp. 275–282. c A.V. Ustinov, 2012, published in Trudy Matematicheskogo Instituta imeni V.A. Stek