http://reply.papertrans.cn/3/211/21099/21099-31.png
Submitted on: 07 March 2000.
Revised on: 26 March 2000.
Accepted on: 17 April 2000.
Machines---MDPI
Submitted on: 28 December 2000.
Revised on: 07 February 2001.
Accepted on: 17 February 2001.
Machines
http://reply.papertrans.cn/3/211/21099/21099-34.png
Submitted on: 31 October 2009.
Revised on: 09 November 2009.
Accepted on: 27 November 2009.
Machines---MDPI
Submitted on: 01 July 2006.
Revised on: 07 August 2006.
Accepted on: 23 August 2006.
Machines