Submitted on: 19 October 1999.
Revised on: 20 November 1999.
Accepted on: 16 December 1999.
Materials---MDPI
Submitted on: 20 December 2013.
Revised on: 31 January 2014.
Accepted on: 15 February 2014.
Materials---MDPI
Submitted on: 08 September 2001.
Revised on: 18 October 2001.
Accepted on: 05 November 2001.
Materials
Submitted on: 27 October 2009.
Revised on: 04 November 2009.
Accepted on: 23 November 2009.
Materials---MDPI
http://reply.papertrans.cn/3/214/21338/21338-25.png
Submitted on: 06 September 2015.
Revised on: 16 September 2015.
Accepted on: 09 October 2015.
Materials
Submitted on: 04 April 2020.
Revised on: 17 April 2020.
Accepted on: 10 May 2020.
Materials---MDPI
Submitted on: 17 March 2012.
Revised on: 28 April 2012.
Accepted on: 05 May 2012.
Materials
http://reply.papertrans.cn/3/214/21338/21338-29.png
Submitted on: 04 June 2017.
Revised on: 27 June 2017.
Accepted on: 12 July 2017.
Materials---MDPI