{2006:www.coe-econbus.keio.ac.jp:data:DP2006-037.pdf} Îˆä ‰Á‘ãŽq + ŽR“c “Ä—T. "•n¢‚Ì“®‘Ô•ªÍ: KHPS‚ÉŠî‚­3 ”NŠÔ‚Ì“®‘Ô" (KUMQRP Discussion Paper Series: DP2006-037). Graduate School of Economics and Graduate School of Business and Commerce, Keio University (Tokyo). . . Lang=JPN.
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