Generalizations of a theorem of doležal
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[1] Tosio Kato. Perturbation theory for linear operators , 1966 .
[2] V. Dolezal. The existence of a continuous basis of a certain linear subspace of $E\sb{r}$ which depends on a parameter , 1964 .
[3] F. Rellich,et al. Störungstheorie der Spektralzerlegung , 1937 .
[4] Leonard Weiss,et al. Doležal's theorem, linear algebra with continuously parametrized elements, and time-varying systems , 1969, Mathematical systems theory.