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https://desdelamediterrania.cat/2015/04/09/els-empedocles-moderns-eugene-anatole-demarcay-1896-i-lelement-63-eu-europi-nilhexitri-nht/
Els empèdocles moderns – Eugène-Anatole Demarçay (1896) i l’element 63 (Eu) – europi (nilhexitri, Nht)