@book{755167,
	author = {Gohberg, Israel  and Goldberg, Seymour},
	title = {Classes of linear operators Vol. II},
	publisher = {Springer},
	year = {1993},
	series = {Operator Theory: Advances and applications},
	address = {Switzerland},
	note = {Operator Theory: Advances and applications - Vol. 63}
}