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 April 29, 2025. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/733.