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https://desdelamediterrania.cat/2014/05/09/els-empedocles-moderns-hennig-brand-1669-i-lelement-15-p-fosfor-nilunpenti-nup/
Els empèdocles moderns – Hennig Brand (1669) i l’element 15 (P) – fòsfor (nilunpenti, Nup)