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2. , , and , Higher Transcendental Functions, Vol. 2, McGraw-Hill, New York, 1953.
3. Singular perturbations and asymptotic eigenvalue degeneracy
4. Perturbation Theory for Linear Operators, Springer-Verlag, Berlin, 1966.
5. and , The scaling limit of |Φ|41 is Brownian motion on the surface of a sphere, in preparation.