Geodesic
Strictly positive solutions of periodic systems of ordinary differential equations
Differencialʹnye uravneniâ, Tome 9 (1973) no. 11, pp. 1945-1955 
B. M. Arkhipov; A. Ya. Khokhryakov. Strictly positive solutions of periodic systems of ordinary differential equations. Differencialʹnye uravneniâ, Tome 9 (1973) no. 11, pp. 1945-1955. http://geodesic.mathdoc.fr/item/DE_1973_9_11_a2/
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     author = {B. M. Arkhipov and A. Ya. Khokhryakov},
     title = {Strictly positive solutions of periodic systems of ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1945--1955},
     year = {1973},
     volume = {9},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_11_a2/}
}
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