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https://desdelamediterrania.cat/2014/02/06/els-empedocles-moderns-jules-janssen-1868-i-lelement-2-he-heli-nilnilbii-nnb/
Els empèdocles moderns – Jules Janssen (1868) i l’element 2 (He) – heli (nilnilbii, Nnb)