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Submitted on: 21 April 2012.
Revised on: 30 April 2012.
Accepted on: 19 May 2012.
Ukrainian Mathematical Journal
Submitted on: 12 May 2000.
Revised on: 21 May 2000.
Accepted on: 13 June 2000.
Ukrainian Mathematical Journal
Submitted on: 06 March 2010.
Revised on: 16 March 2010.
Accepted on: 10 April 2010.
Ukrainian Mathematical Journal
Submitted on: 17 March 2008.
Revised on: 18 April 2008.
Accepted on: 23 April 2008.
Ukrainian Mathematical Journal
Submitted on: 17 May 2012.
Revised on: 25 May 2012.
Accepted on: 02 June 2012.
Ukrainian Mathematical Journal
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