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Submitted on: 04 September 2001.
Revised on: 17 December 2001.
Accepted on: 01 January 2002.
___________________FERROELECTRICS LETTERS SECTION
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Submitted on: 24 September 2016.
Revised on: 28 December 2016.
Accepted on: 04 February 2017.
___________________FERROELECTRICS LETTERS SECTION
Submitted on: 26 February 2004.
Revised on: 17 June 2004.
Accepted on: 07 August 2004.
___________________FERROELECTRICS LETTERS SECTION
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Submitted on: 19 July 2011.
Revised on: 15 November 2011.
Accepted on: 03 January 2012.
___________________FERROELECTRICS LETTERS SECTION
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Submitted on: 15 November 2008.
Revised on: 30 January 2009.
Accepted on: 26 February 2009.
___________________FERROELECTRICS LETTERS SECTION
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