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Dyfyniad Arddull ChicagoKato, Tosio. Perturbation Theory for Linear Operators. 2nd ed. Berlin: Springer-Verlag, 1976.
Dyfyniad MLAKato, Tosio. Perturbation Theory for Linear Operators. 2nd ed. Springer-Verlag, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.