Submitted on: 13 June 2000.
Revised on: 17 September 2000.
Accepted on: 10 October 2000.
___________________Concrete Operators---DE GRUYTER POLAND SP Z O O
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Submitted on: 27 June 2004.
Revised on: 24 July 2004.
Accepted on: 14 September 2004.
___________________Concrete Operators---DE GRUYTER POLAND SP Z O O
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Submitted on: 31 October 2011.
Revised on: 24 December 2011.
Accepted on: 27 January 2012.
___________________Concrete Operators---DE GRUYTER POLAND SP Z O O
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Submitted on: 22 February 2016.
Revised on: 06 June 2016.
Accepted on: 14 July 2016.
___________________Concrete Operators---DE GRUYTER POLAND SP Z O O