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- J. Phys. B: Atom. Molec. Phys., Vol. 7. No. 18, 1974. Printed in Great Britain. 0 1974 The Rayleigh-Schrodinger perturbation and the linked-
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- Presented at Symposium in honor of Professor Indrek Martinson, Lund, September 2003 (to appear in Physics Scripta)
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