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	1.	No cover image available No cover image available No cover image available Differential equations with approximate and improper data. Lecture [given at] New York University, Fall 1954-55/ Notes by Peter Ungar. by John, Fritz, 1910- Publication details: [New York]: 1955?] Availability: Items available for loan: Castorina (1)Call number: 515.35 J65d 1955 IMPA. Place hold Add to cart (remove)
	2.	No cover image available No cover image available No cover image available Plane waves and spherical means applied to partial differential equations/ Fritz John. by John, Fritz, 1910- Series: Interscience tracts in pure and applied mathematics ; no. 2 Publication details: New York: Interscience Publishers, [1955] Availability: Items available for loan: Castorina (2)Call number: 515.35 J65p 1955 IMPA, ... Found in Open Library: Place hold Add to cart (remove)

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