Submitted on: 02 March 2001.
Revised on: 31 May 2001.
Accepted on: 13 June 2001.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
Submitted on: 14 July 2019.
Revised on: 23 October 2019.
Accepted on: 23 November 2019.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
Submitted on: 06 December 2010.
Revised on: 08 March 2011.
Accepted on: 26 April 2011.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
Submitted on: 28 December 2010.
Revised on: 23 January 2011.
Accepted on: 18 March 2011.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
Submitted on: 14 September 2018.
Revised on: 20 October 2018.
Accepted on: 16 December 2018.
___________________INTERNATIONAL JOURNAL OF MODERN PHYSICS E
http://reply.papertrans.cn/2/139/13802/13802-36.png