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Submitted on: 24 October 2000.
Revised on: 15 November 2000.
Accepted on: 30 December 2000.
___________________JOURNAL OF THE KOREAN MATHEMATICAL SOCIETY
Submitted on: 19 August 2013.
Revised on: 19 September 2013.
Accepted on: 26 October 2013.
___________________JOURNAL OF THE KOREAN MATHEMATICAL SOCIETY
Submitted on: 31 December 2013.
Revised on: 31 January 2014.
Accepted on: 19 February 2014.
___________________JOURNAL OF THE KOREAN MATHEMATICAL SOCIETY
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Submitted on: 14 August 2001.
Revised on: 18 November 2001.
Accepted on: 05 December 2001.
___________________JOURNAL OF THE KOREAN MATHEMATICAL SOCIETY