"Memória sobre las Máquinas Algébricas" (PDF). Revista de Obras Públicas (in Spanish) (28): 217–222. Leonardo Torres. Memoria sobre las máquinas algébricas:...
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Guardian. 23 May 2009. Retrieved 27 April 2022. "Keyboard Design for the LISP Machine". Xah Keyboard Guide. Retrieved 27 April 2022. "Tabs and tab stops"...
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