Submitted on: 26 May 1999.
Revised on: 04 July 1999.
Accepted on: 02 August 1999.
___________________Chalcogenide Letters---VIRTUAL CO PHYSICS SRL
Submitted on: 11 June 2002.
Revised on: 13 September 2002.
Accepted on: 26 September 2002.
___________________Chalcogenide Letters---VIRTUAL CO PHYSICS SRL
http://reply.papertrans.cn/1/51/5042/5042-13.png
Submitted on: 13 December 2020.
Revised on: 07 February 2021.
Accepted on: 22 February 2021.
___________________Chalcogenide Letters---VIRTUAL CO PHYSICS SRL
Submitted on: 17 June 2016.
Revised on: 18 September 2016.
Accepted on: 10 November 2016.
___________________Chalcogenide Letters---VIRTUAL CO PHYSICS SRL
Submitted on: 07 October 2008.
Revised on: 26 December 2008.
Accepted on: 18 January 2009.
___________________Chalcogenide Letters---VIRTUAL CO PHYSICS SRL
http://reply.papertrans.cn/1/51/5042/5042-17.png
Submitted on: 08 December 2002.
Revised on: 10 March 2003.
Accepted on: 03 May 2003.
___________________Chalcogenide Letters---VIRTUAL CO PHYSICS SRL
http://reply.papertrans.cn/1/51/5042/5042-19.png
Submitted on: 11 July 2011.
Revised on: 02 August 2011.
Accepted on: 07 September 2011.
___________________Chalcogenide Letters---VIRTUAL CO PHYSICS SRL