Feldmann, H (1997). „History of the tuning fork. I: Invention of the tuning fork, its course in music and natural sciences. Pictures from the history of otorhinolaryngology, presented by instruments from the collection of the Ingolstadt German Medical History Museum”. Laryngo-Rhino-Otologie76 (2), 116–122. o. DOI:10.1055/s-2007-997398. PMID9172630.
(1999) „Dynamics of Transversely Vibrating Beams Using Four Engineering Theories”. Journal of Sound and Vibration225 (5), 935. o. DOI:10.1006/jsvi.1999.2257.
Feldmann, H (1997). „History of the tuning fork. I: Invention of the tuning fork, its course in music and natural sciences. Pictures from the history of otorhinolaryngology, presented by instruments from the collection of the Ingolstadt German Medical History Museum”. Laryngo-Rhino-Otologie76 (2), 116–122. o. DOI:10.1055/s-2007-997398. PMID9172630.