Geodesic
An effective criterion for the existence and constancy of sign of the Green's function for certain difference boundary value problems
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1967), pp. 102-106.

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@article{IVM_1967_1_a15,
     author = {A. L. Teptin},
     title = {An effective criterion for the existence and constancy of sign of the {Green's} function for certain difference boundary value problems},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {102--106},
     publisher = {mathdoc},
     number = {1},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1967_1_a15/}
}
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A. L. Teptin. An effective criterion for the existence and constancy of sign of the Green's function for certain difference boundary value problems. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1967), pp. 102-106. http://geodesic.mathdoc.fr/item/IVM_1967_1_a15/