http://purl.org/dc/terms/source
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https://collection.rcgs.jp/resource/VARIATION0008020
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https://ja.wikipedia.org/wiki/龍田直樹 (accessed 2019-12-11)
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https://www.mobygames.com/developer/sheet/view/developerId,184538/ (accessed 2019-12-11)
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https://www.wikidata.org/entity/Q933540 (accessed 2020-08-28)
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