Submitted on: 23 June 2007.
Revised on: 15 July 2007.
Accepted on: 13 August 2007.
___________________Friction---TSINGHUA UNIV PRESS
http://reply.papertrans.cn/2/102/10141/10141-22.png
Submitted on: 16 February 2015.
Revised on: 28 April 2015.
Accepted on: 18 June 2015.
___________________Friction---TSINGHUA UNIV PRESS
http://reply.papertrans.cn/2/102/10141/10141-24.png
http://reply.papertrans.cn/2/102/10141/10141-25.png
http://reply.papertrans.cn/2/102/10141/10141-26.png
Submitted on: 12 July 2003.
Revised on: 29 August 2003.
Accepted on: 15 October 2003.
___________________Friction---TSINGHUA UNIV PRESS
Submitted on: 26 February 1998.
Revised on: 14 June 1998.
Accepted on: 09 July 1998.
___________________Friction---TSINGHUA UNIV PRESS
http://reply.papertrans.cn/2/102/10141/10141-29.png
Submitted on: 18 December 2015.
Revised on: 23 January 2016.
Accepted on: 08 March 2016.
___________________Friction---TSINGHUA UNIV PRESS