Geodesic
Sturm theorems for equations on graphs
Doklady Akademii Nauk, Tome 309 (1989) no. 6, pp. 1306-1308

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@article{DAN_1989_309_6_a5,
     author = {Yu. V. Pokorny and O. M. Penkin},
     title = {Sturm theorems for equations on graphs},
     journal = {Doklady Akademii Nauk},
     pages = {1306--1308},
     publisher = {mathdoc},
     volume = {309},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_6_a5/}
}
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Yu. V. Pokorny; O. M. Penkin. Sturm theorems for equations on graphs. Doklady Akademii Nauk, Tome 309 (1989) no. 6, pp. 1306-1308. http://geodesic.mathdoc.fr/item/DAN_1989_309_6_a5/