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- [2] COMBES JM, UNPUBLISHED
- [3] ICHINOSE T, TO BE PUBLISHED
- [4] Kato T., 1966, PERTURBATION THEORY, V132, P396
- [6] REED M, 1972, METHODS MODERN MATHE
- [7] REED MA, IN PRESS
- [8] SIMON B, 1970, HELV PHYS ACTA, V43, P607
- [10] SIMON B, TO BE PUBLISHED