Submitted on: 22 April 2013.
Revised on: 26 May 2013.
Accepted on: 10 June 2013.
___________________Communications Faculty of Sciences University of Ankara-Series A1 Mathematics and Statistics
Submitted on: 10 August 2001.
Revised on: 19 November 2001.
Accepted on: 03 January 2002.
___________________Communications Faculty of Sciences University of Ankara-Series A1 Mathematics and Statistics
Submitted on: 17 October 2008.
Revised on: 04 January 2009.
Accepted on: 01 February 2009.
___________________Communications Faculty of Sciences University of Ankara-Series A1 Mathematics and Statistics
Submitted on: 30 June 2016.
Revised on: 16 October 2016.
Accepted on: 01 December 2016.
___________________Communications Faculty of Sciences University of Ankara-Series A1 Mathematics and Statistics
Submitted on: 01 August 2005.
Revised on: 23 November 2005.
Accepted on: 21 December 2005.
___________________Communications Faculty of Sciences University of Ankara-Series A1 Mathematics and Statistics
Submitted on: 08 January 2014.
Revised on: 28 February 2014.
Accepted on: 29 March 2014.
___________________Communications Faculty of Sciences University of Ankara-Series A1 Mathematics and Statistics
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Submitted on: 15 October 2014.
Revised on: 15 December 2014.
Accepted on: 22 January 2015.
___________________Communications Faculty of Sciences University of Ankara-Series A1 Mathematics and Statistics