Geodesic
The limit spectrum of systems of first order differential equations with slowly changing coefficients
Differencialʹnye uravneniâ, Tome 7 (1971) no. 11, pp. 1982-1991 
L. B. Zelenko; F. S. Rofe-Beketov. The limit spectrum of systems of first order differential equations with slowly changing coefficients. Differencialʹnye uravneniâ, Tome 7 (1971) no. 11, pp. 1982-1991. http://geodesic.mathdoc.fr/item/DE_1971_7_11_a5/
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     author = {L. B. Zelenko and F. S. Rofe-Beketov},
     title = {The limit spectrum of systems of first order differential equations with slowly changing coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1982--1991},
     year = {1971},
     volume = {7},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_11_a5/}
}
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