Wszołek, Wiesław, Maciej Modrzejewski, and Monika Przysiężny. 2014. “Acoustic Analysis of Esophageal Speech in Patients After Total Laryngectomy”. Archives of Acoustics 32 (4(S): 151-58. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1403.