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	1.	No cover image available No cover image available No cover image available Perturbation theory of eigenvalue problems; lectures delivered fall 1953/ Notes prepared with the assistance of J. Berkowitz. by Rellich, Franz Publication details: [New York]: Institute of Mathematical Sciences, [1953?] Availability: Items available for loan: Castorina (1)Call number: 515.35 R383p 1953 IMPA. Place hold Add to cart (remove)
	2.	No cover image available No cover image available No cover image available Spectral theory of a second-order ordinary differential operator/ by Franz Rellich ; with an appendix by K. O. Friedrichs ; notes by J. Berkowitz. by Rellich, Franz Courant Institute of Mathematical Sciences Publication details: New York: [New York University Press], 1953 Availability: Items available for loan: Castorina (1)Call number: 515.35 R383s 1953 IMPA. Place hold Add to cart (remove)

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