Yu. G. NAIDYUK, A. NOVAK, I. K. YANSON, and P. N. CHUBOV, Point contact investigations of the heavy fermion compound URu₂Si₂ in the normal and superconducting states, Low Temp. Phys. 17, (1991) [Fiz. Nizk. Temp. 17, 1170-1173, (1991)].