@article{DAN_1964_156_3_a8,
     author = {F. S. Rofe-Beketov},
     title = {A finiteness test for the number of discrete levels which can be introduced into the gaps of the continuous 
},
     journal = {Doklady Akademii Nauk},
     pages = {515--518},
     publisher = {mathdoc},
     volume = {156},
     number = {3},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_156_3_a8/}
}