http://reply.papertrans.cn/3/262/26158/26158-31.png
Submitted on: 19 April 1998.
Revised on: 02 May 1998.
Accepted on: 25 May 1998.
Recent Contributions to Physics
Submitted on: 15 June 2017.
Revised on: 28 June 2017.
Accepted on: 20 July 2017.
Recent Contributions to Physics
http://reply.papertrans.cn/3/262/26158/26158-34.png
http://reply.papertrans.cn/3/262/26158/26158-35.png
http://reply.papertrans.cn/3/262/26158/26158-36.png