TY  - JOUR
AU  - P. P. Kasyankov
TI  - The conditions for the existence of a stigmatic image in electron optical systems having a curvilinear axis
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 497
EP  - 500
VL  - 120
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_120_3_a15/
LA  - ru
ID  - DAN_1958_120_3_a15
ER  -