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Submitted on: 05 February 2008.
Revised on: 19 March 2008.
Accepted on: 01 April 2008.
Ukrainian Mathematical Journal
Submitted on: 27 November 2014.
Revised on: 01 January 2015.
Accepted on: 26 January 2015.
Ukrainian Mathematical Journal
Submitted on: 28 May 2002.
Revised on: 18 June 2002.
Accepted on: 29 June 2002.
Ukrainian Mathematical Journal
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Submitted on: 23 October 2009.
Revised on: 01 December 2009.
Accepted on: 23 December 2009.
Ukrainian Mathematical Journal