Cardamo, Girolamo. 1554. “De Subtilitate, Libri Xiii”. In Hieronymi Cardani Mediolanensis Medici De Subtilitate Libri Xxi, 273–289. Nürnberg. https://archive.org/details/hin-wel-all-00000138-001/page/n316/mode/2up.
Wolf, Oskar. 1871. Sprache Und Ohr: Akustisch-Physiologische Und Pathologische Studien. Braunschweig: Friedrich Viehweg und Sohn. https://reader.digitale-sammlungen.de/de/fs1/object/display/bsb11002822_00005.html.
1820. “On Sounds Inaudible By Certain Ears”. Philosophical Transactions Of The Royal Society Of London: 306-314. https://archive.org/details/philtrans05025818/page/n7/mode/2up.
When the musician Oskar Sala, co-developer and only player of the electronic instrument Trautonium, died on February 26, 2002, aged ninety-one, he had long since settled his legacy.
Politzer, Adam. 1913. Geschichte Der Ohrenheilkunde. Vol. Vol. 2. 2 Vols. vol.. Stuttgart: Ferdinand Enke. https://archive.org/details/ohrenheikundeges02poli/page/n4/mode/2up.
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