Observation of the second harmonic in superconducting current-phase relation of Nb/Au/(001)YBa2Cu3Ox heterojunctionsP. V. Komissinski, E. Il'ichev, G. A. Ovsyannikov, S. A. Kovtonyuk, M. Grajcar, R. Hlubina, Z. Ivanov, Y. Tanaka, N. Yoshida and S. KashiwayaEurophys. Lett., 57 4 (2002) 585-591DOI: https://doi.org/10.1209/epl/i2002-00501-8