Submitted on: 29 August 2016.
Revised on: 17 October 2016.
Accepted on: 11 December 2016.
___________________AMB Express---SPRINGER
http://reply.papertrans.cn/1/13/1229/1229-12.png
Submitted on: 09 October 2015.
Revised on: 26 January 2016.
Accepted on: 07 March 2016.
___________________AMB Express---SPRINGER
http://reply.papertrans.cn/1/13/1229/1229-14.png
http://reply.papertrans.cn/1/13/1229/1229-15.png
http://reply.papertrans.cn/1/13/1229/1229-16.png
Submitted on: 29 November 1999.
Revised on: 15 March 2000.
Accepted on: 28 April 2000.
___________________AMB Express---SPRINGER
Submitted on: 27 June 2015.
Revised on: 29 September 2015.
Accepted on: 10 November 2015.
___________________AMB Express---SPRINGER
http://reply.papertrans.cn/1/13/1229/1229-19.png
http://reply.papertrans.cn/1/13/1229/1229-20.png