TY  - JOUR
AU  - È. I. Grudo
AU  - L. F. Yanchuk
TI  - Inequalities of Gronwall, Bihari and Langenhop type for Pfaffian systems
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 749
EP  - 752
VL  - 13
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_4_a21/
LA  - ru
ID  - DE_1977_13_4_a21
ER  -