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We thank K. Symanzik for informing us of this point.
G. Hoopt: talk at Coral Gables, Florida, January {dy1977}, University of Utrecht preprint.
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Ng, W.C., Yeung, W.B. New procedure for summing perturbation theory. Lett. Nuovo Cimento 23, 413–418 (1978). https://doi.org/10.1007/BF02787001
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DOI: https://doi.org/10.1007/BF02787001