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Submitted on: 19 October 2014.
Revised on: 30 October 2014.
Accepted on: 25 November 2014.
Periodica Polytechnica-Civil Engineering
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Submitted on: 19 June 1999.
Revised on: 07 July 1999.
Accepted on: 02 August 1999.
Periodica Polytechnica-Civil Engineering
Submitted on: 06 February 2009.
Revised on: 27 February 2009.
Accepted on: 18 March 2009.
Periodica Polytechnica-Civil Engineering
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