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‹ΛŒ΄N‰h (2004-08). g‰’•ΔŽε—v‘‚̐­Ž‘Ž‘‹ΰ§“xh (PDF). ’²Έ‚Əξ•ρ-Issue Brief- (‘—§‘‰ο}‘ŠΩ) (454). NDLJP:1000733. http://www.ndl.go.jp/jp/data/publication/issue/0454.pdf. 
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