Submitted on: 22 December 2002.
Revised on: 30 January 2003.
Accepted on: 19 February 2003.
MATHEMATICAL NOTES---MAIK NAUKA/INTERPERIODICA/SPRINGER
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Submitted on: 28 May 2015.
Revised on: 05 June 2015.
Accepted on: 28 June 2015.
MATHEMATICAL NOTES
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Submitted on: 16 March 2018.
Revised on: 31 March 2018.
Accepted on: 17 April 2018.
MATHEMATICAL NOTES
Submitted on: 31 July 2015.
Revised on: 29 August 2015.
Accepted on: 26 September 2015.
MATHEMATICAL NOTES---MAIK NAUKA/INTERPERIODICA/SPRINGER
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