@book{Kato:1966:PTL,
	title = {Perturbation Theory for Linear Operators},
	author = {Tosio Kato},
	key = {eigenvalues, hilbert spaces},
	pages = {xix + 592},
	year = {1966},
	biburl = {http://www.bibsonomy.org/bibtex/2ee37aa5451e22c2ba157c4d96a0247c3/schmitz},
	sthbib = {M3 Kat 81 60}, bibdate = {Fri Nov 24 15:18:30 1995}, lccn = {QA320 .K33}, bibsource = {ftp://ftp.math.utah.edu/pub/bibnet/authors/m/matched-field-proc.bib}, alias = {Kato 66},
	keywords = {analysis eigenvalue eigenvector perturbation spectral }
}