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1. Singularly perturbed differential operators of second order / by Groen, Peter Paul Nicolaas de. Publication: Amsterdam : Mathematisch Centrum, 1976 . ix, 159 p. ; , Originally published as the author's thesis, Vrije Universiteit van Amsterdam. 24 cm. Date: 1976 Availability: Items available: School of Theoretical Physics Library [510.08 AMS] (1),
2. Variational methods in mathematics, science, and engineering / by Rektorys, Karel. Publication: Dordrecht, Holland ; | Boston, U.S.A. : D. Reidel Pub. Co., 1980 . 571 p. : , Includes index. 27 cm. Date: 1980 Availability: Items available: School of Theoretical Physics Library [515.8 REK] (1),