Submitted on: 22 September 2004.
Revised on: 27 October 2004.
Accepted on: 18 November 2004.
MATHEMATICAL LOGIC QUARTERLY
http://reply.papertrans.cn/3/215/21443/21443-32.png
http://reply.papertrans.cn/3/215/21443/21443-33.png
Submitted on: 27 April 2005.
Revised on: 16 May 2005.
Accepted on: 12 June 2005.
MATHEMATICAL LOGIC QUARTERLY
http://reply.papertrans.cn/3/215/21443/21443-35.png
Submitted on: 17 April 1999.
Revised on: 16 May 1999.
Accepted on: 26 May 1999.
MATHEMATICAL LOGIC QUARTERLY