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Lovera, G. R. Accademia Delle Scienze di Torino Sunti Degli Atti 1940–1941 - Vol. LXXVI. Nuovo Cim 19, 21–23 (1942). https://doi.org/10.1007/BF02961311
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DOI: https://doi.org/10.1007/BF02961311