@article{GDZPPN002334569,
title = {Definitizing polynomials of unitary and Hermitian operators in Pontrjagin spaces.},
journal = {Mathematische Annalen},
volume = {287},
year = {1990},
pages = {231-244},
zbl = {0694.47018},
url = {http://dml.mathdoc.fr/item/GDZPPN002334569}
}
Sasvári, Zoltán; Langer, Heinz. Definitizing polynomials of unitary and Hermitian operators in Pontrjagin spaces.. Mathematische Annalen, Tome 287 (1990) pp. 231-244. http://gdmltest.u-ga.fr/item/GDZPPN002334569/