Geodesic
Definitizing polynomials of unitary and Hermitian operators in Pontrjagin spaces.
Mathematische Annalen, Tome 288 (1990) no. 1, pp. 231-244.

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Mots-clés : Pontryagin spaces, -space, Hermitian operator, definitizing functions, unitary operator, essentially selfadjoint operator, definitizing polynomial 
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     author = {Zolt\'an Sasv\'ari and Heinz Langer},
     title = {Definitizing polynomials of unitary and {Hermitian} operators in {Pontrjagin} spaces.},
     journal = {Mathematische Annalen},
     pages = {231--244},
     publisher = {mathdoc},
     volume = {288},
     number = {1},
     year = {1990},
     zbl = {0694.47018},
     url = {http://geodesic.mathdoc.fr/item/MAN_1990__288_1_164734/}
}
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Zoltán Sasvári; Heinz Langer. Definitizing polynomials of unitary and Hermitian operators in Pontrjagin spaces.. Mathematische Annalen, Tome 288 (1990) no. 1, pp. 231-244. http://geodesic.mathdoc.fr/item/MAN_1990__288_1_164734/