Submitted on: 23 May 2014.
Revised on: 13 September 2014.
Accepted on: 21 October 2014.
___________________ARCHIVES OF MECHANICS---POLISH ACAD SCIENCES INST FUNDAMENTAL TECHNOLOGICAL RESEARCH
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Submitted on: 06 March 1999.
Revised on: 10 April 1999.
Accepted on: 07 May 1999.
___________________ARCHIVES OF MECHANICS---POLISH ACAD SCIENCES INST FUNDAMENTAL TECHNOLOGICAL RESEARCH
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