1. Anonymous. Ludwig van Beethoven: lithograph by I.G. Fritzsche after a painting by Ferdinand Georg Waldmüller [in German]. Beethoven-Haus, Bonn [cited 2023 Jul 18]. https://www.beethoven.de/en/media/view/6234496605093888
2. Genomic analyses of hair from Ludwig van Beethoven.;Begg;Curr Biol,2023
3. A modern case sheds light on a classical enigma: Beethoven’s deafness.;Brotto;Laryngoscope,2021
4. Davies PJ. Beethoven in person: his deafness, illnesses, and death. Praeger (Westport, CT); 2001.
5. De Sapio M. The mystique of late Beethoven [cited 2023 Jul 18]. https://theimaginativeconservative.org/2020/10/mystique-late-beethoven-michael-de-sapio.html