http://purl.org/dc/terms/source
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https://collection.rcgs.jp/resource/PACKAGE0009849
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https://id.ndl.go.jp/auth/ndlna/01144726 (accessed 2018-10-25)
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https://ja.wikipedia.org/wiki/5pb.#旧株式会社5pb. (accessed 2018-10-25)
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https://www.mobygames.com/company/5pb-inc (accessed 2018-10-25)
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