Stankiewicz, B., B. Adamczyk, K. Zieliński, and M. Darowski. “Visual Feedback Based on Expired CO2 As a Therapy Method for Respiratory Disturbances in Stuttering”. Archives of Acoustics 31, no. 4 (April 11, 2014): 439–444. Accessed January 17, 2026. https://acoustics.ippt.gov.pl/index.php/aa/article/view/733.