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Submitted on: 09 July 2006.
Revised on: 16 September 2006.
Accepted on: 10 November 2006.
___________________Acta Crystallographica Section B-Structural Science Crystal Engineering and Materials
Submitted on: 02 March 2001.
Revised on: 03 June 2001.
Accepted on: 20 June 2001.
___________________Acta Crystallographica Section B-Structural Science Crystal Engineering and Materials
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