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https://desdelamediterrania.cat/2014/11/20/els-empedocles-moderns-carlo-perrier-1937-i-lelement-43-tc-tecneci-nilquaditri-nqt/
Els empèdocles moderns – Carlo Perrier (1937) i l’element 43 (Tc) – tecneci (nilquaditri, Nqt)