Generalized tridiagonal matrices and Sturm's theorem
Doklady Akademii Nauk, Tome 275 (1984) no. 2, pp. 277-280.

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     author = {V. A. Bulavskii and M. A. Yakovleva},
     title = {Generalized tridiagonal matrices and {Sturm's} theorem},
     journal = {Doklady Akademii Nauk},
     pages = {277--280},
     publisher = {mathdoc},
     volume = {275},
     number = {2},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_275_2_a3/}
}
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V. A. Bulavskii; M. A. Yakovleva. Generalized tridiagonal matrices and Sturm's theorem. Doklady Akademii Nauk, Tome 275 (1984) no. 2, pp. 277-280. http://geodesic.mathdoc.fr/item/DAN_1984_275_2_a3/