http://reply.papertrans.cn/3/274/27329/27329-11.png
Submitted on: 20 August 2013.
Revised on: 30 August 2013.
Accepted on: 13 September 2013.
Romanian Reports in Physics
Submitted on: 21 July 2005.
Revised on: 28 August 2005.
Accepted on: 04 September 2005.
Romanian Reports in Physics---EDITURA ACAD ROMANE
http://reply.papertrans.cn/3/274/27329/27329-14.png
http://reply.papertrans.cn/3/274/27329/27329-15.png
http://reply.papertrans.cn/3/274/27329/27329-16.png
Submitted on: 31 January 2003.
Revised on: 11 March 2003.
Accepted on: 21 March 2003.
Romanian Reports in Physics
http://reply.papertrans.cn/3/274/27329/27329-18.png
Submitted on: 08 January 2015.
Revised on: 14 February 2015.
Accepted on: 19 February 2015.
Romanian Reports in Physics---EDITURA ACAD ROMANE
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