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Helmholtz, Hermann von. 1853. On the methods of measuring very small portions of time, and their application to physiological purposes. The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science 4: 313-325
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ISSN 1866-4784: reference - xlink
Max Planck Institute for the History of Science, Berlin Institut für Information und Medien, Sprache und Kultur (I:IMSK), Universität Regensburg Fakultät Medien, Bauhaus-Universität Weimar