Kupka, M., & Farkasovsky, P. (1992). Calculation of point-contact spectra for a simple heavy -fermion Hamiltonian by two approaches. Comparison of results. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, 18(5), 531–533. вилучено із https://fnt.ilt.kharkiv.ua/index.php/fnt/article/view/f18-0531e