TY  - JOUR
AU  - A. S. Gurtovnik
AU  - Yu. I. Neimark
TI  - Investigation of the neighborhood of a family of invariant toroidal manifolds
JO  - Differencialʹnye uravneniâ
PY  - 1973
SP  - 821
EP  - 831
VL  - 9
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1973_9_5_a4/
LA  - ru
ID  - DE_1973_9_5_a4
ER  -