Strojek, Katarzyna, Anna Karpińska, Urszula Kaźmierczak, Walery Zukow, and Agnieszka Radzimińska. 2017. “Rehabilitation of Speech in Parkinson’s Disease”. Journal of Education, Health and Sport 7 (12):212-21. https://apcz.umk.pl/JEHS/article/view/5161.