@article{ZVMMF_1986_26_3_a14,
     author = {N. N. Kalitkin and I. V. Ritus},
     title = {Smooth approximation of {Fermi{\textendash}Dirac} functions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {461--465},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1986_26_3_a14/}
}