BARTECKI, Nikodem and STROJEK, Katarzyna. Relaxation techniques as an element supporting the functioning of the speech apparatus - a review of the literature. Journal of Education, Health and Sport. Online. 16 October 2025. Vol. 85, p. 66157. [Accessed 27 December 2025]. DOI 10.12775/JEHS.2025.85.66157.