Cita APA (7th ed.)

Katō, T. (1966). Perturbation theory for linear operators. Springer.

Cita Chicago (17th ed.)

Katō, Tosio. Perturbation Theory for Linear Operators. Berlin: Springer, 1966.

Cita MLA (8th ed.)

Katō, Tosio. Perturbation Theory for Linear Operators. Springer, 1966.