Submitted on: 16 August 2016.
Revised on: 08 September 2016.
Accepted on: 27 September 2016.
___________________JOURNAL OF ALGEBRA---ACADEMIC PRESS INC ELSEVIER SCIENCE
Submitted on: 14 June 1999.
Revised on: 19 August 1999.
Accepted on: 05 October 1999.
___________________JOURNAL OF ALGEBRA---ACADEMIC PRESS INC ELSEVIER SCIENCE
http://reply.papertrans.cn/2/152/15194/15194-33.png
Submitted on: 27 May 2015.
Revised on: 07 September 2015.
Accepted on: 14 October 2015.
___________________JOURNAL OF ALGEBRA---ACADEMIC PRESS INC ELSEVIER SCIENCE
Submitted on: 11 October 2010.
Revised on: 21 January 2011.
Accepted on: 07 March 2011.
___________________JOURNAL OF ALGEBRA---ACADEMIC PRESS INC ELSEVIER SCIENCE
Submitted on: 04 February 2011.
Revised on: 20 April 2011.
Accepted on: 17 May 2011.
___________________JOURNAL OF ALGEBRA---ACADEMIC PRESS INC ELSEVIER SCIENCE