http://purl.org/dc/terms/source
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http://www.sofel.co.jp/ (accessed 2020-08-03)
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https://collection.rcgs.jp/resource/PACKAGE0000238
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https://collection.rcgs.jp/resource/PACKAGE0001637
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https://ja.wikipedia.org/wiki/ソフエル (accessed 2018-10-25)
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https://www.mobygames.com/company/sofel-co-ltd (accessed 2018-10-25)
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