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	1.	Spectral theory of ordinary differential operators/ Erich Müller-Pfeiffer ; translation editor, M. S. P. Eastham. by Müller-Pfeiffer, Erich, 1930- Series: Ellis Horwood series in mathematics and its applications Publication details: Chichester: New York: Ellis Horwood, J. Wiley, 1981 Availability: Items available for loan: Castorina (1)Call number: 515.35 M958s 1981 IMPA. Found in Open Library: 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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