@article{IVM_1970_11_a2,
     author = {V. I. Gracheva},
     title = {Certain cases of differentiable mappings of {Euclidean} spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {22--30},
     publisher = {mathdoc},
     number = {11},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_11_a2/}
}