TY  - JOUR
AU  - I. P. Karklin'
TI  - Topological equivalence of linear systems of Pfaffian equations in neighborhoods of their one-dimensional closed characteristics
JO  - Differencialʹnye uravneniâ
PY  - 1972
SP  - 1943
EP  - 1949
VL  - 8
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1972_8_11_a3/
LA  - ru
ID  - DE_1972_8_11_a3
ER  -