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http://www.thocp.net/hardware/univac.htm Escaneada de las publicaciones anuales de la Historia de la computación , vol . 3 # 4 de octubre de 1981
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https://www.interaction-design.org/literature/book/the-encyclopedia-of-human-computer-interaction-2nd-ed/human-computer-interaction-brief-intro Cortesía de Grubitzsch ( geb. Rafael) , Waltraud . Copyright: CC- Att -SA - 3 ( Creative Commons Atribución -Compartir Igual 3.0 ) .
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