Submitted on: 24 December 2020.
Revised on: 31 January 2021.
Accepted on: 23 February 2021.
JSIAM Letters---JAPAN SOC INDUSTRIAL & APPLIED MATHEMATICS-JSIAM
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Submitted on: 26 February 2011.
Revised on: 27 March 2011.
Accepted on: 11 April 2011.
JSIAM Letters---JAPAN SOC INDUSTRIAL & APPLIED MATHEMATICS-JSIAM
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Submitted on: 19 November 2000.
Revised on: 21 December 2000.
Accepted on: 12 January 2001.
JSIAM Letters---JAPAN SOC INDUSTRIAL & APPLIED MATHEMATICS-JSIAM
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