https://www.neuschwanstein.de/spanisch/luis/biograf.htm
https://www.biografiasyvidas.com/biografia/s/swan.htm
https://www.lainformacion.com/practicopedia/como-se-invento-la-bombilla/6508453/
https://curiosfera-historia.com/quien-invento-la-bombilla-y-su-historia/
https://www.youtube.com/watch?v=8skpWQeeLDM
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