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 Cet article a éte moissonné depuis la source Math-Net.Ru

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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},
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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/

[1] Teptin A. L., “O neostsillyatsii reshenii i znake funktsii Grina”, Differents. uravneniya, 20:6 (1984), 995–1005 | MR | Zbl

[2] Tonkov E. L., Khokhryakov A. Ya., Yuberev N. N., “O funktsii Grina periodicheskoi kraevoi zadachi i suschestvovanii periodicheskikh reshenii obyknovennogo differentsialnogo uravneniya”, Tr. TIKhM'a, 2, Tambov, 1968, 16–20