Submitted on: 13 April 2020.
Revised on: 21 July 2020.
Accepted on: 18 August 2020.
___________________Analysis in Theory and Applications
Submitted on: 12 January 2015.
Revised on: 28 April 2015.
Accepted on: 26 May 2015.
___________________Analysis in Theory and Applications
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Submitted on: 27 April 1999.
Revised on: 03 July 1999.
Accepted on: 26 August 1999.
___________________Analysis in Theory and Applications
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Submitted on: 15 April 2023.
Revised on: 13 July 2023.
Accepted on: 23 July 2023.
___________________Analysis in Theory and Applications
Submitted on: 15 May 2012.
Revised on: 10 June 2012.
Accepted on: 15 July 2012.
___________________Analysis in Theory and Applications
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