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Observation of the second harmonic in superconducting current-phase relation of Nb/Au/(001)YBa2Cu3Ox heterojunctions, P. V. Komissinski, E. Il'ichev, G. A. Ovsyannikov, S. A. Kovtonyuk, M. Grajcar, R. Hlubina, Z. Ivanov, Y. Tanaka, N. Yoshida, S. Kashiwaya
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Komissinski et al. (2002) studied this question.
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