TY  - JOUR
AU  - F. S. Rofe-Beketov
TI  - A finiteness test for the number of discrete levels which can be introduced into the gaps of the continuous 

JO  - Doklady Akademii Nauk
PY  - 1964
SP  - 515
EP  - 518
VL  - 156
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1964_156_3_a8/
LA  - ru
ID  - DAN_1964_156_3_a8
ER  -