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熊谷 定義. "〔69〕管球焦点の大いさが影像の拡大率と尖鋭度に及ぼす影響と実際の諸問題に就て(日本放射線技術学会研究発表抄録集)." Japanese Journal of Radiological Technology First10Anniv.0 (1955) 65