Submitted on: 02 March 2019.
Revised on: 04 May 2019.
Accepted on: 17 May 2019.
___________________Bulletin Mathematique de la Societe des Sciences Mathematiques de Roumanie
Submitted on: 24 October 2023.
Revised on: 11 January 2024.
Accepted on: 13 February 2024.
___________________Bulletin Mathematique de la Societe des Sciences Mathematiques de Roumanie
Submitted on: 10 December 2012.
Revised on: 26 March 2013.
Accepted on: 15 May 2013.
___________________Bulletin Mathematique de la Societe des Sciences Mathematiques de Roumanie
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Submitted on: 14 August 2005.
Revised on: 16 November 2005.
Accepted on: 27 November 2005.
___________________Bulletin Mathematique de la Societe des Sciences Mathematiques de Roumanie
Submitted on: 09 March 2000.
Revised on: 11 June 2000.
Accepted on: 01 August 2000.
___________________Bulletin Mathematique de la Societe des Sciences Mathematiques de Roumanie
Submitted on: 19 July 2002.
Revised on: 14 September 2002.
Accepted on: 13 October 2002.
___________________Bulletin Mathematique de la Societe des Sciences Mathematiques de Roumanie
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