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Submitted on: 21 October 2011.
Revised on: 10 November 2011.
Accepted on: 16 November 2011.
PalZ---SPRINGER HEIDELBERG
Submitted on: 09 December 2011.
Revised on: 29 December 2011.
Accepted on: 12 January 2012.
PalZ---SPRINGER HEIDELBERG
Submitted on: 26 January 2022.
Revised on: 21 February 2022.
Accepted on: 16 March 2022.
PalZ
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Submitted on: 24 June 2014.
Revised on: 22 July 2014.
Accepted on: 27 July 2014.
PalZ
http://reply.papertrans.cn/3/241/24015/24015-18.png
Submitted on: 02 March 2007.
Revised on: 10 March 2007.
Accepted on: 02 April 2007.
PalZ---SPRINGER HEIDELBERG
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