Submitted on: 30 June 2010.
Revised on: 18 August 2010.
Accepted on: 05 September 2010.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica
Submitted on: 14 July 2011.
Revised on: 27 August 2011.
Accepted on: 20 October 2011.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica
Submitted on: 08 April 2009.
Revised on: 17 June 2009.
Accepted on: 13 July 2009.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica
Submitted on: 19 February 2021.
Revised on: 04 May 2021.
Accepted on: 07 June 2021.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica
Submitted on: 24 November 2024.
Revised on: 11 March 2025.
Accepted on: 26 April 2025.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica
Submitted on: 28 December 2016.
Revised on: 17 April 2017.
Accepted on: 09 May 2017.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica
Submitted on: 17 September 2021.
Revised on: 19 December 2021.
Accepted on: 04 February 2022.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica
Submitted on: 08 June 2007.
Revised on: 06 September 2007.
Accepted on: 23 September 2007.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica
Submitted on: 07 December 2003.
Revised on: 11 March 2004.
Accepted on: 29 April 2004.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica
Submitted on: 12 July 1999.
Revised on: 29 August 1999.
Accepted on: 22 October 1999.
___________________Analele Stiintifice ale Universitatii Ovidius Constanta-Seria Matematica