Submitted on: 16 March 2017.
Revised on: 03 July 2017.
Accepted on: 03 August 2017.
___________________Crystallography Reviews---TAYLOR & FRANCIS LTD
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Submitted on: 17 November 2002.
Revised on: 01 February 2003.
Accepted on: 26 February 2003.
___________________Crystallography Reviews---TAYLOR & FRANCIS LTD
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