Olesiak, Beata, Agnieszka Przedborska, and Jan Wojciech Raczkowski. 2019. “Influence of Ultrasound Therapy on Volume of the Synovial Fluid in Knee Joint Arthrosis (gonarthrosis)-Initial Reports”. Journal of Education, Health and Sport 9 (2):413-20. https://apcz.umk.pl/JEHS/article/view/6631.