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D. N., Ferretti, B. R. Accademia Dei Lincei Sunti Dei Rendiconti 1∘ Semestre 1935-XIII - Vol. XXI. Nuovo Cim 13, 134–139 (1936). https://doi.org/10.1007/BF02961188
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DOI: https://doi.org/10.1007/BF02961188