Geodesic
Inequalities of Gronwall, Bihari and Langenhop type for Pfaffian systems
Differencialʹnye uravneniâ, Tome 13 (1977) no. 4, pp. 749-752 
È. I. Grudo; L. F. Yanchuk. Inequalities of Gronwall, Bihari and Langenhop type for Pfaffian systems. Differencialʹnye uravneniâ, Tome 13 (1977) no. 4, pp. 749-752. http://geodesic.mathdoc.fr/item/DE_1977_13_4_a21/
@article{DE_1977_13_4_a21,
     author = {\`E. I. Grudo and L. F. Yanchuk},
     title = {Inequalities of {Gronwall,} {Bihari} and {Langenhop} type for {Pfaffian} systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {749--752},
     year = {1977},
     volume = {13},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_4_a21/}
}
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