Choosing roots of polynomials smoothly, II
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D. Alekseevsky, A. Kriegl, M. Losik and P. W. Michor,Choosing roots of polynomials smoothly, Israel Journal of Mathematics105 (1998), 203–233, arXiv: math.CA/9801026.
M. D. Bronshtein,Smoothness of polynomials depending on parameters, Sibirskii Matematicheskii Zhurnal20 (1979), 493–501 (Russian); English transl.: Siberian Mathematical Journal20 (1980), 347–352.
A. Kriegl and P. W. Michor,Differentiable perturbation of unbounded operators, Mathematische Annalen, to appear, arXiv: math.FA/0204060.
Y. Ohya and S. Tarama,Le problème de Cauchy à caracteristiques multiples dans la classe de Gevrey (coefficients Hölderiens en t), inHyperbolic Equations and Related Topics, Proceedings of the Taniguchi International Symposium, Katata and Kyoto/Jap. 1984, Academic Press, Boston, 1986, pp. 273–306.