Submitted on: 21 November 2002.
Revised on: 27 January 2003.
Accepted on: 17 February 2003.
___________________International Journal of Population Data Science (IJPDS)
Submitted on: 28 November 2019.
Revised on: 09 March 2020.
Accepted on: 04 May 2020.
___________________International Journal of Population Data Science (IJPDS)
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Submitted on: 12 June 2018.
Revised on: 01 September 2018.
Accepted on: 14 October 2018.
___________________International Journal of Population Data Science (IJPDS)
http://reply.papertrans.cn/2/140/13970/13970-25.png
Submitted on: 29 October 2018.
Revised on: 17 February 2019.
Accepted on: 03 April 2019.
___________________International Journal of Population Data Science (IJPDS)
http://reply.papertrans.cn/2/140/13970/13970-27.png
http://reply.papertrans.cn/2/140/13970/13970-28.png
Submitted on: 29 August 2017.
Revised on: 11 December 2017.
Accepted on: 07 January 2018.
___________________International Journal of Population Data Science (IJPDS)
Submitted on: 01 June 2000.
Revised on: 04 August 2000.
Accepted on: 04 September 2000.
___________________International Journal of Population Data Science (IJPDS)