APA Citation

Friedrichs, K. O. ;. Perturbation of Spectra in Hilbert Space. American Mathematical Society, Providence, 1965.

Chicago Style Citation

Friedrichs, Kurt O.. Perturbation of Spectra in Hilbert Space. American Mathematical Society, Providence, 1965.

MLA Citation

Friedrichs, Kurt O.. Perturbation of Spectra in Hilbert Space. American Mathematical Society, Providence, 1965.

Warning: These citations may not always be 100% accurate.