Βιβλιογραφική Τεκμηρίωση:
Exhaled nasal nitric oxide during humming: potential clinical tool in sinonasal disease?Maniscalco M, Pelaia G, Sofia M.Biomark Med. 2013 Apr;7(2):261-6.
Humming Facilitates a Gradual Increase in Vocal Intensity by Alleviating the Enhancement of Vocal Fold Contact and Supraglottic Constriction. de Hoop T, Ogawa M, Iwahashi T, Umatani M, Hosokawa K, Kato C, Inohara H.J Voice. 2021 Jan;35(1):156.e1-156.e13.