Geodesic
On the sign of the Green's function of a~boundary value problem with periodic and Sturm's boundary conditions
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2008), pp. 150-151

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Conditions are presented under which the Green's function of a boundary value problem with two Sturm's boundary conditions and $n-2$ periodic boundary conditions preserves its sign. 
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     author = {A. L. Teptin},
     title = {On the sign of the {Green's} function of a~boundary value problem with periodic and {Sturm's} boundary conditions},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {150--151},
     publisher = {mathdoc},
     number = {2},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2008_2_a49/}
}
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A. L. Teptin. On the sign of the Green's function of a~boundary value problem with periodic and Sturm's boundary conditions. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2008), pp. 150-151. http://geodesic.mathdoc.fr/item/VUU_2008_2_a49/