@article{DAN_1963_153_1_a2,
     author = {B. A. Vostretsov},
     title = {Conditions for a function of many variables to be representable as a sum of a finite number 
},
     journal = {Doklady Akademii Nauk},
     pages = {16--19},
     publisher = {mathdoc},
     volume = {153},
     number = {1},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_153_1_a2/}
}