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[文献書誌] Ko Hara: "A Determination of the Magnetic Flux Quantum Using Superconducting Magnetic Levitation System" CPEM '90 DIGEST. 183 (1990)
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[文献書誌] Ko Hara: "Improvement of the Superconducting Magnetic Levitation System for the Determination of the Magnetic Flux Quantum" IEEE Trans.on Instr.& Meas.38. 225-228 (1989)
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[文献書誌] Ko Hara: "IーV Characteris of NbNーNbN Josephson Point Contact" Japn.J.Appl.Phys.27. L677-L679 (1988)
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[文献書誌] Ko Hara: "Absolute Measurement of the Magnetic Flux Quantum Using a Superconducting Magnetic Levitation System" Superconductivity Electronics(オ-ム・Prentice Hall). 109-112 (1987)
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[文献書誌] Ko Hara: "Microbridge Utilizing Step Edge(MUSE)and its Application" Superconductivity Electronics(オ-ム・Prentice Hall). 198-201 (1987)
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[文献書誌] 原 宏編著: "量子電磁気計測" 電子情報通信学会, (1991)
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[文献書誌] 原 宏: "超伝導のはなし" 日刊工業新聞社, 172 (1987)