http://reply.papertrans.cn/3/226/22507/22507-31.png
Submitted on: 02 January 2011.
Revised on: 15 January 2011.
Accepted on: 01 February 2011.
NAGOYA MATHEMATICAL JOURNAL---CAMBRIDGE UNIV PRESS
http://reply.papertrans.cn/3/226/22507/22507-33.png
http://reply.papertrans.cn/3/226/22507/22507-34.png
http://reply.papertrans.cn/3/226/22507/22507-35.png
http://reply.papertrans.cn/3/226/22507/22507-36.png