Hermann von Helmholtz: Perbedaan antara revisi
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* "[http://books.google.com/books?vid=0CZkDzy7hqYWpJVqcWCZAHZ&id=5aUOAAAAIAAJ&pg=PT17 Hermann von Helmholtz]" (Obituary). Royal Society (Great Britain). (1894). Proceedings of the Royal Society of London. London: Printed by Taylor and Francis.
* "[http://www.archive.org/details/hermannvonhelmho00koenrich Hermann von Helmholtz]" by Leo Koenigsberger (Oxford: Clarendon press, 1906) from [[Internet Archive]]
* "[http://plato.stanford.edu/entries/hermann-helmholtz Hermann von Helmholtz]" article by Lydia Patton, Stanford Encyclopedia of Philosophy
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