http://purl.org/dc/terms/source
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https://collection.rcgs.jp/resource/PACKAGE0009950
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https://en.wikipedia.org/wiki/Nival_(company) (accessed 2018-12-08)
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https://ja.wikipedia.org/wiki/ニーバル (accessed 2018-12-08)
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https://www.mobygames.com/company/nival-inc (accessed 2018-12-08)
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