Geodesic
On the existence and constancy of sign of Green's function of scalar equations of high order with almost periodic coefficients
Izvestiya. Mathematics , Tome 3 (1969) no. 6, pp. 1319-1334.

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The conditions of positivity and negativity of the Green's function of a linear scalar differential operator of the second and higher orders with almost periodic coefficients are investigated. 
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V. Sh. Burd; Yu. S. Kolesov; M. A. Krasnosel'skii. On the existence and constancy of sign of Green's function of scalar equations of high order with almost periodic coefficients. Izvestiya. Mathematics , Tome 3 (1969) no. 6, pp. 1319-1334. http://geodesic.mathdoc.fr/item/IM2_1969_3_6_a9/

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