Submitted on: 18 June 2013.
Revised on: 21 August 2013.
Accepted on: 18 October 2013.
___________________Acta Technica Napocensis Series-Applied Mathematics Mechanics and Engineering
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Submitted on: 27 August 2023.
Revised on: 03 November 2023.
Accepted on: 16 December 2023.
___________________Acta Technica Napocensis Series-Applied Mathematics Mechanics and Engineering
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Submitted on: 05 June 2002.
Revised on: 10 August 2002.
Accepted on: 28 September 2002.
___________________Acta Technica Napocensis Series-Applied Mathematics Mechanics and Engineering
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