@article{IVM_1962_4_a18,
     author = {N. A. Stolyarov},
     title = {A theorem on difference quotients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {152--154},
     publisher = {mathdoc},
     number = {4},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1962_4_a18/}
}