%0 Journal Article
%A A. L. Teptin
%T An effective criterion for the existence and constancy of sign of the Green's function for certain difference boundary value problems
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1967
%P 102-106
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1967_1_a15/
%G ru
%F IVM_1967_1_a15