Stankiewicz B, Adamczyk B, Zieliński K, Darowski M. Visual feedback based on expired CO2 as a therapy method for respiratory disturbances in stuttering. Arch. Acoust. [Internet]. 2014 Apr. 11 [cited 2025 May 15];31(4):439-44. Available from: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/733