@article{DAN_1960_134_6_a3,
     author = {K. K. Golovkin},
     title = {Conditions for the smoothness of functions},
     journal = {Doklady Akademii Nauk},
     pages = {1283--1286},
     publisher = {mathdoc},
     volume = {134},
     number = {6},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_134_6_a3/}
}