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Submitted on: 09 June 1999.
Revised on: 19 July 1999.
Accepted on: 13 September 1999.
___________________Bulletin of the Institute of Mathematics Academia Sinica New Series
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Submitted on: 20 May 2012.
Revised on: 31 August 2012.
Accepted on: 04 October 2012.
___________________Bulletin of the Institute of Mathematics Academia Sinica New Series
Submitted on: 18 April 2001.
Revised on: 02 July 2001.
Accepted on: 20 July 2001.
___________________Bulletin of the Institute of Mathematics Academia Sinica New Series
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http://reply.papertrans.cn/1/44/4373/4373-17.png
Submitted on: 26 April 2016.
Revised on: 12 July 2016.
Accepted on: 09 September 2016.
___________________Bulletin of the Institute of Mathematics Academia Sinica New Series
Submitted on: 20 November 2020.
Revised on: 25 February 2021.
Accepted on: 13 April 2021.
___________________Bulletin of the Institute of Mathematics Academia Sinica New Series
Submitted on: 05 July 2001.
Revised on: 30 July 2001.
Accepted on: 28 September 2001.
___________________Bulletin of the Institute of Mathematics Academia Sinica New Series