Submitted on: 13 December 2020.
Revised on: 18 January 2021.
Accepted on: 20 February 2021.
___________________Friction---TSINGHUA UNIV PRESS
Submitted on: 26 June 1999.
Revised on: 12 September 1999.
Accepted on: 13 October 1999.
___________________Friction---TSINGHUA UNIV PRESS
Submitted on: 25 April 2007.
Revised on: 22 August 2007.
Accepted on: 17 October 2007.
___________________Friction---TSINGHUA UNIV PRESS
http://reply.papertrans.cn/2/102/10141/10141-34.png
Submitted on: 18 October 2019.
Revised on: 18 January 2020.
Accepted on: 31 January 2020.
___________________Friction---TSINGHUA UNIV PRESS
Submitted on: 19 June 2011.
Revised on: 15 September 2011.
Accepted on: 13 November 2011.
___________________Friction---TSINGHUA UNIV PRESS