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Hyok-Jon Kwon, K. Sengupta, and Victor M. Yakovenko, Fractional ac Josephson effect in unconventional superconductors: Сверхпроводимость и мезоскопические структуры, Low Temp. Phys. 30, (2004) [Fiz. Nizk. Temp. 30, 814-822, (2004)] DOI: https://doi.org/10.1063/1.1789931.