References
E. R. Caianiello:Nuovo Cimento,11, 492 (1954);12, 561 (1954);1, 337 (1955).
B. Ferretti:Nuovo Cimento,10, 3 (1953).
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Caianiello, E.R. Non-perturbative expansions. Nuovo Cim 2, 186–188 (1955). https://doi.org/10.1007/BF02856026
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DOI: https://doi.org/10.1007/BF02856026