Submitted on: 17 October 2002.
Revised on: 14 December 2002.
Accepted on: 26 December 2002.
___________________Astronomy and Computing---ELSEVIER
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Submitted on: 27 December 2015.
Revised on: 12 February 2016.
Accepted on: 01 April 2016.
___________________Astronomy and Computing---ELSEVIER
Submitted on: 17 November 2000.
Revised on: 27 February 2001.
Accepted on: 13 March 2001.
___________________Astronomy and Computing---ELSEVIER
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Submitted on: 25 October 2005.
Revised on: 07 February 2006.
Accepted on: 19 March 2006.
___________________Astronomy and Computing---ELSEVIER
Submitted on: 16 February 2017.
Revised on: 09 May 2017.
Accepted on: 17 June 2017.
___________________Astronomy and Computing---ELSEVIER
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