http://reply.papertrans.cn/1/10/974/974-11.png
Submitted on: 02 October 1999.
Revised on: 28 December 1999.
Accepted on: 16 January 2000.
___________________Agrekon---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
http://reply.papertrans.cn/1/10/974/974-13.png
Submitted on: 05 May 2005.
Revised on: 30 June 2005.
Accepted on: 04 August 2005.
___________________Agrekon---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
http://reply.papertrans.cn/1/10/974/974-15.png
http://reply.papertrans.cn/1/10/974/974-16.png
Submitted on: 29 June 2003.
Revised on: 11 August 2003.
Accepted on: 04 October 2003.
___________________Agrekon---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
Submitted on: 10 February 2012.
Revised on: 27 April 2012.
Accepted on: 20 May 2012.
___________________Agrekon---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
http://reply.papertrans.cn/1/10/974/974-19.png
http://reply.papertrans.cn/1/10/974/974-20.png