Submitted on: 05 December 2008.
Revised on: 26 December 2008.
Accepted on: 22 January 2009.
Vestnik Tomskogo Gosudarstvennogo Universiteta-Matematika i Mekhanika-Tomsk State University Journal of Mathematics and Mechanics
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Submitted on: 05 September 2004.
Revised on: 02 October 2004.
Accepted on: 21 October 2004.
Vestnik Tomskogo Gosudarstvennogo Universiteta-Matematika i Mekhanika-Tomsk State University Journal of Mathematics and Mechanics
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Submitted on: 19 September 2012.
Revised on: 29 September 2012.
Accepted on: 17 October 2012.
Vestnik Tomskogo Gosudarstvennogo Universiteta-Matematika i Mekhanika-Tomsk State University Journal of Mathematics and Mechanics
Submitted on: 09 October 2014.
Revised on: 17 November 2014.
Accepted on: 05 December 2014.
Vestnik Tomskogo Gosudarstvennogo Universiteta-Matematika i Mekhanika-Tomsk State University Journal of Mathematics and Mechanics