Geodesic
The representation of the fundamental matrices of completely integrable linear homogeneous Pfaffian systems with an irregular singular point
Differencialʹnye uravneniâ, Tome 13 (1977) no. 11, pp. 1940-1950 
È. I. Grudo. The representation of the fundamental matrices of completely integrable linear homogeneous Pfaffian systems with an irregular singular point. Differencialʹnye uravneniâ, Tome 13 (1977) no. 11, pp. 1940-1950. http://geodesic.mathdoc.fr/item/DE_1977_13_11_a4/
@article{DE_1977_13_11_a4,
     author = {\`E. I. Grudo},
     title = {The representation of the fundamental matrices of completely integrable linear homogeneous {Pfaffian} systems with an irregular singular point},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1940--1950},
     year = {1977},
     volume = {13},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_11_a4/}
}
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