@article{IVM_1971_3_a12,
     author = {V. A. Startsev},
     title = {A~certain generalization of the concepts of symmetric continuity and symmetric differentiability},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {92--100},
     publisher = {mathdoc},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1971_3_a12/}
}