Submitted on: 01 September 2019.
Revised on: 09 September 2019.
Accepted on: 24 September 2019.
Mathematical Reports---EDITURA ACAD ROMANE
Submitted on: 15 August 2012.
Revised on: 22 August 2012.
Accepted on: 02 September 2012.
Mathematical Reports
Submitted on: 16 September 1999.
Revised on: 10 October 1999.
Accepted on: 06 November 1999.
Mathematical Reports---EDITURA ACAD ROMANE
Submitted on: 16 August 2012.
Revised on: 16 September 2012.
Accepted on: 26 September 2012.
Mathematical Reports---EDITURA ACAD ROMANE
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Submitted on: 31 May 1999.
Revised on: 21 June 1999.
Accepted on: 13 July 1999.
Mathematical Reports---EDITURA ACAD ROMANE
Submitted on: 12 May 2008.
Revised on: 10 June 2008.
Accepted on: 24 June 2008.
Mathematical Reports
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Submitted on: 03 September 2021.
Revised on: 11 October 2021.
Accepted on: 17 October 2021.
Mathematical Reports---EDITURA ACAD ROMANE
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