Geodesic
The problem of the conjugacy of certain nonstationary differential equations of order $2m$
Differencialʹnye uravneniâ, Tome 7 (1971) no. 4, pp. 750-753 
V. I. Korzyuk. The problem of the conjugacy of certain nonstationary differential equations of order $2m$. Differencialʹnye uravneniâ, Tome 7 (1971) no. 4, pp. 750-753. http://geodesic.mathdoc.fr/item/DE_1971_7_4_a15/
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     author = {V. I. Korzyuk},
     title = {The problem of the conjugacy of certain nonstationary differential equations of order $2m$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {750--753},
     year = {1971},
     volume = {7},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_4_a15/}
}
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