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https://desdelamediterrania.cat/2014/07/31/els-empedocles-moderns-georg-brandt-1732-i-lelement-27-co-cobalt-nilbisepti-nbs/
Els empèdocles moderns – Georg Brandt (1732) i l’element 27 (Co) – cobalt (nilbisepti, Nbs)