Submitted on: 16 September 2015.
Revised on: 14 October 2015.
Accepted on: 21 October 2015.
LINGUA
Submitted on: 06 March 2009.
Revised on: 17 April 2009.
Accepted on: 05 May 2009.
LINGUA---ELSEVIER
Submitted on: 25 July 1999.
Revised on: 03 August 1999.
Accepted on: 08 August 1999.
LINGUA
http://reply.papertrans.cn/3/209/20892/20892-34.png
Submitted on: 11 August 2017.
Revised on: 19 September 2017.
Accepted on: 25 September 2017.
LINGUA---ELSEVIER
http://reply.papertrans.cn/3/209/20892/20892-36.png