Geodesic
A generalization of a theorem of H. Wittich
Differencialʹnye uravneniâ, Tome 11 (1975) no. 2, pp. 388-389 
I. P. Martynov. A generalization of a theorem of H. Wittich. Differencialʹnye uravneniâ, Tome 11 (1975) no. 2, pp. 388-389. http://geodesic.mathdoc.fr/item/DE_1975_11_2_a22/
@article{DE_1975_11_2_a22,
     author = {I. P. Martynov},
     title = {A generalization of a theorem of {H.} {Wittich}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {388--389},
     year = {1975},
     volume = {11},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_2_a22/}
}
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