TY  - JOUR
AU  - V. F. Lazutkin
AU  - T. F. Pankratova
TI  - Normal forms and versal deformations for Hill's equation
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1975
SP  - 41
EP  - 48
VL  - 9
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1975_9_4_a4/
LA  - ru
ID  - FAA_1975_9_4_a4
ER  -