Geodesic
On the theory of quadratic pencils of self-adjoint operators
Doklady Akademii Nauk, Tome 154 (1964) no. 6, pp. 1258-1261.

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     author = {M. G. Krein and G. K. Langer},
     title = {On the theory of quadratic pencils of self-adjoint operators},
     journal = {Doklady Akademii Nauk},
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     number = {6},
     year = {1964},
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     url = {http://geodesic.mathdoc.fr/item/DAN_1964_154_6_a3/}
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M. G. Krein; G. K. Langer. On the theory of quadratic pencils of self-adjoint operators. Doklady Akademii Nauk, Tome 154 (1964) no. 6, pp. 1258-1261. http://geodesic.mathdoc.fr/item/DAN_1964_154_6_a3/