1. Perturbation Theory for Linear Operators;Kato,1976
2. For a review, see, A. Messiah, Quantum Mechanics, Vol. II, North-Holland, Amsterdam, 1966, and A. Galindo, P. Pascual, Quantum Mechanics, Vols. I and II, Springer Verlag, Berlin, 1990.
3. Advanced Mathematical Methods for Scientists and Engineers: Asymptotic Methods and Perturbation Theory;Bender,1999
4. Application of the Borel Method of Summation to a Quantum Mechanical Model Problem
5. A new method for summation of divergent power series