Submitted on: 29 August 2011.
Revised on: 07 October 2011.
Accepted on: 01 November 2011.
Mathematical Population Studies
http://reply.papertrans.cn/3/215/21462/21462-22.png
Submitted on: 18 October 1998.
Revised on: 15 November 1998.
Accepted on: 20 November 1998.
Mathematical Population Studies
http://reply.papertrans.cn/3/215/21462/21462-24.png
http://reply.papertrans.cn/3/215/21462/21462-25.png
Submitted on: 19 February 2014.
Revised on: 05 March 2014.
Accepted on: 26 March 2014.
Mathematical Population Studies
Submitted on: 06 April 2022.
Revised on: 24 April 2022.
Accepted on: 07 May 2022.
Mathematical Population Studies
http://reply.papertrans.cn/3/215/21462/21462-28.png
Submitted on: 09 August 2011.
Revised on: 21 August 2011.
Accepted on: 07 September 2011.
Mathematical Population Studies
Submitted on: 05 November 2010.
Revised on: 29 November 2010.
Accepted on: 10 December 2010.
Mathematical Population Studies