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This work was supported by the United States Atomic Energy Commission under contract number AT (11-1)1619.
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Fair, W., Luke, Y.L. Padé approximations to the operator exponential. Numer. Math. 14, 379–382 (1970). https://doi.org/10.1007/BF02165592
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DOI: https://doi.org/10.1007/BF02165592