Hermann von Helmholtz
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- http://plato.stanford.edu/entries/hermann-helmholtz/
- http://www.hps.cam.ac.uk/whipple/explore/acoustics/hermanvonhelmholtz/helmholtzresonators/
- http://www.hps.cam.ac.uk/whipple/explore/acoustics/hermanvonhelmholtz/helmholtzssynthesizer/
- http://cpcesimas01.pucsp.br/jspui/simple-search?query=Helmholtz