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@article{DE_1977_13_11_a23, author = {G. S. Tabidze}, title = {The disconjugacy of a second order linear difference equation}, journal = {Differencialʹnye uravneni\^a}, pages = {2093--2095}, publisher = {mathdoc}, volume = {13}, number = {11}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_11_a23/} }
G. S. Tabidze. The disconjugacy of a second order linear difference equation. Differencialʹnye uravneniâ, Tome 13 (1977) no. 11, pp. 2093-2095. http://geodesic.mathdoc.fr/item/DE_1977_13_11_a23/