http://purl.org/dc/terms/source
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http://www.polyphony.co.jp/company/ (accessed 2018-12-19)
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https://collection.rcgs.jp/resource/PACKAGE0005922
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https://ja.wikipedia.org/wiki/ポリフォニー・デジタル (accessed 2018-10-25)
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https://www.mobygames.com/company/polyphony-digital-inc (accessed 2018-12-19)
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