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Application of Z −1 expansion method to 1s3d 1 D and 3 D states of Helium: Configuration interaction calculation and correlation energy

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Das Gupta, N.K., Ali, M.A. Application of Z −1 expansion method to 1s3d 1 D and 3 D states of Helium: Configuration interaction calculation and correlation energy. Theoret. Chim. Acta 5, 455–458 (1966). https://doi.org/10.1007/BF00527051

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