TY  - JOUR
AU  - N. A. Izobov
TI  - On the existence of a linear Pfaffian system with a countable number of distinct characteristic sets of solutions
JO  - Differencialʹnye uravneniâ
PY  - 1998
SP  - 735
EP  - 743
VL  - 34
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1998_34_6_a2/
LA  - ru
ID  - DE_1998_34_6_a2
ER  -