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
OPERATIONS RESEARCH LETTERS, vol. 36, no. 2, page. 177 - 183, 2008-03