@book{12676,
	author = {Kato, Tosio},
	title = {A short introduction to perturbation theory for linear operators},
	publisher = {Springer-Verlag,},
	year = {1982},
	address = {New York:},
	note = {"Slightly expanded version of chapters 1 & 2 of Tosio Kato 'Perturbation theory for linear operators, 2nd ed.'"}
}