Submitted on: 27 April 2006.
Revised on: 19 August 2006.
Accepted on: 30 September 2006.
___________________Eurasian Mathematical Journal---L N GUMILYOV EURASIAN NATL UNIV
Submitted on: 08 September 2019.
Revised on: 28 November 2019.
Accepted on: 08 January 2020.
___________________Eurasian Mathematical Journal---L N GUMILYOV EURASIAN NATL UNIV
Submitted on: 21 April 2020.
Revised on: 22 June 2020.
Accepted on: 04 August 2020.
___________________Eurasian Mathematical Journal---L N GUMILYOV EURASIAN NATL UNIV
Submitted on: 10 March 2019.
Revised on: 01 April 2019.
Accepted on: 14 April 2019.
___________________Eurasian Mathematical Journal---L N GUMILYOV EURASIAN NATL UNIV
Submitted on: 19 March 2022.
Revised on: 25 May 2022.
Accepted on: 05 July 2022.
___________________Eurasian Mathematical Journal---L N GUMILYOV EURASIAN NATL UNIV
Submitted on: 11 August 2014.
Revised on: 20 November 2014.
Accepted on: 06 December 2014.
___________________Eurasian Mathematical Journal---L N GUMILYOV EURASIAN NATL UNIV
Submitted on: 26 March 2020.
Revised on: 30 May 2020.
Accepted on: 22 June 2020.
___________________Eurasian Mathematical Journal---L N GUMILYOV EURASIAN NATL UNIV
Submitted on: 27 November 2008.
Revised on: 01 January 2009.
Accepted on: 18 February 2009.
___________________Eurasian Mathematical Journal---L N GUMILYOV EURASIAN NATL UNIV
Submitted on: 19 May 2010.
Revised on: 22 August 2010.
Accepted on: 01 September 2010.
___________________Eurasian Mathematical Journal---L N GUMILYOV EURASIAN NATL UNIV
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