Geodesic
A proof of the existence of nonregular systems of linear differential equations with quasiperiodic coefficients
Differencialʹnye uravneniâ, Tome 5 (1969) no. 11, pp. 1979-1983 
V. M. Millionshchikov. A proof of the existence of nonregular systems of linear differential equations with quasiperiodic coefficients. Differencialʹnye uravneniâ, Tome 5 (1969) no. 11, pp. 1979-1983. http://geodesic.mathdoc.fr/item/DE_1969_5_11_a2/
@article{DE_1969_5_11_a2,
     author = {V. M. Millionshchikov},
     title = {A proof of the existence of nonregular systems of linear differential equations with quasiperiodic coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1979--1983},
     year = {1969},
     volume = {5},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_11_a2/}
}
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