Submitted on: 09 November 2007.
Revised on: 23 December 2007.
Accepted on: 12 January 2008.
Transactions of the London Mathematical Society
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http://reply.papertrans.cn/3/298/29716/29716-33.png
Submitted on: 10 November 2004.
Revised on: 15 December 2004.
Accepted on: 08 January 2005.
Transactions of the London Mathematical Society
Submitted on: 04 February 2009.
Revised on: 07 March 2009.
Accepted on: 11 March 2009.
Transactions of the London Mathematical Society
Submitted on: 01 February 2008.
Revised on: 27 February 2008.
Accepted on: 04 March 2008.
Transactions of the London Mathematical Society