Submitted on: 26 November 2010.
Revised on: 31 January 2011.
Accepted on: 17 February 2011.
___________________COLLOQUIUM MATHEMATICUM---ARS POLONA-RUCH
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Submitted on: 08 April 2019.
Revised on: 28 July 2019.
Accepted on: 11 August 2019.
___________________COLLOQUIUM MATHEMATICUM---ARS POLONA-RUCH
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Submitted on: 03 March 2016.
Revised on: 25 April 2016.
Accepted on: 05 June 2016.
___________________COLLOQUIUM MATHEMATICUM---ARS POLONA-RUCH
Submitted on: 05 January 2019.
Revised on: 01 May 2019.
Accepted on: 03 June 2019.
___________________COLLOQUIUM MATHEMATICUM---ARS POLONA-RUCH
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Submitted on: 22 May 2017.
Revised on: 21 July 2017.
Accepted on: 19 August 2017.
___________________COLLOQUIUM MATHEMATICUM---ARS POLONA-RUCH
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