Bloch, Agata, Małgorzata Kordowska, Ewa Frankiewicz, Krystian Kałużny, Anna Kałużna, Magdalena Hagner-Derengowska, and Walery Zukow. 2018. “Comparison of Local Cryotherapy and Sonotherapy Effectiveness in the Treatment of Gonarthrosis Symptoms”. Journal of Education, Health and Sport 8 (11):653-64. https://apcz.umk.pl/JEHS/article/view/6611.