Geodesic
The Cauchy problem for systems of linear partial differential equations with variable coefficients
Differencialʹnye uravneniâ, Tome 2 (1966) no. 11, pp. 1520-1530 
V. A. Sochneva. The Cauchy problem for systems of linear partial differential equations with variable coefficients. Differencialʹnye uravneniâ, Tome 2 (1966) no. 11, pp. 1520-1530. http://geodesic.mathdoc.fr/item/DE_1966_2_11_a11/
@article{DE_1966_2_11_a11,
     author = {V. A. Sochneva},
     title = {The {Cauchy} problem for systems of linear partial differential equations with variable coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1520--1530},
     year = {1966},
     volume = {2},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_11_a11/}
}
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