@article{IVM_1997_1_a7,
     author = {S. Ya. Serovaǐskiǐ},
     title = {Extendedly differentiable manifolds},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {56--65},
     publisher = {mathdoc},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1997_1_a7/}
}