TY  - JOUR
AU  - V. S. Medvedev
TI  - Sufficient conditions for the absence of integral cycles of Pfaffian systems of manifolds
JO  - Differencialʹnye uravneniâ
PY  - 1970
SP  - 1896
EP  - 1900
VL  - 6
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1970_6_10_a19/
LA  - ru
ID  - DE_1970_6_10_a19
ER  -