Geodesic
Some questions of the qualitative theory of ordinary linear homogeneous differential equations with variable coefficients
Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta, Mathematics. Vol. VII, Tome 165 (1954) no. 165, pp. 39-78 
A. D. Gorbunov. Some questions of the qualitative theory of ordinary linear homogeneous differential equations with variable coefficients. Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta, Mathematics. Vol. VII, Tome 165 (1954) no. 165, pp. 39-78. http://geodesic.mathdoc.fr/item/UZMU_1954_165_165_a2/
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     author = {A. D. Gorbunov},
     title = {Some questions of the qualitative theory of ordinary linear homogeneous differential equations with variable coefficients},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {39--78},
     year = {1954},
     volume = {165},
     number = {165},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1954_165_165_a2/}
}
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