TY  - JOUR
AU  - F. A. Neimark
TI  - On the deficiency index of a~differential operator
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1962
VL  - 17
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1962_17_4_a11/
LA  - ru
ID  - RM_1962_17_4_a11
ER  -