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JOURNAL OF BANKING & FINANCE, vol. 32, no. 12, page. 2617 - 2627, 2008-12
JOURNAL OF COMPUTATIONAL ANALYSIS AND APPLICATIONS, vol. 10, no. 3, page. 271 - 281, 2008-07
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JOURNAL OF THE KOREAN MATHEMATICAL SOCIETY, vol. 44, no. 1, page. 139 - 150, 2007-01