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Cai, F., Li, P., Xie, K. et al. Superconductivity of Pb films studied with superconducting Pb tips. Sci. China Phys. Mech. Astron. 62, 17421 (2019). https://doi.org/10.1007/s11433-018-9269-3
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DOI: https://doi.org/10.1007/s11433-018-9269-3