@article{MZM_1985_38_5_a14,
     author = {A. V. Asriev},
     title = {A lemma on smoothing},
     journal = {Matemati\v{c}eskie zametki},
     pages = {764--769},
     year = {1985},
     volume = {38},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_38_5_a14/}
}