Submitted on: 12 August 2006.
Revised on: 25 November 2006.
Accepted on: 16 December 2006.
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Submitted on: 15 February 2014.
Revised on: 11 March 2014.
Accepted on: 25 March 2014.
___________________JOURNAL OF CRYSTAL GROWTH---ELSEVIER
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Submitted on: 17 February 2000.
Revised on: 30 May 2000.
Accepted on: 04 July 2000.
___________________JOURNAL OF CRYSTAL GROWTH---ELSEVIER