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Yu.G. Naidyuk, N.V. Gamayunova, O.E. Kvitnitskaya, G. Fuchs, D.A. Chareev, and A.N. Vasiliev, Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state, Low Temp. Phys. 42, (2015) [Fiz. Nizk. Temp. 42, 42-48, (2015)] DOI: https://doi.org/10.1063/1.4939153 .