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Publikováno v:
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics. 53(3)
Pad\'e approximants are able to sum effectively the Rayleigh-Schr\"odinger perturbation series for the ground state energy of the quartic anharmonic oscillator, as well as the corresponding renormalized perturbation expansion [E. J. Weniger, J. \ifmm