@article{10_4064_ap101_3_7,
     author = {Krzysztof Jan Nowak},
     title = {Quasianalytic perturbation of multi-parameter
 hyperbolic polynomials and symmetric matrices},
     journal = {Annales Polonici Mathematici},
     pages = {275--291},
     publisher = {mathdoc},
     volume = {101},
     number = {3},
     year = {2011},
     doi = {10.4064/ap101-3-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap101-3-7/}
}