Naidyuk, Y.; Gamayunova, N.; Kvitnitskaya, O.; Fuchs, G.; Chareev, D.; Vasiliev, A. Analysis of Nonlinear Conductivity of Point Contacts on the Base of FeSe in the Normal and Superconducting State. Fiz. Nizk. Temp. 2015, 42, 42-48.