Chepurna, V. “THE DYNAMICS OF RESPIRATORY SYSTEM FUNCTION IN SCHOOLCHILDREN UNDER THE INFLUENCE OF KHATKA-YOGA HEALTH-IMPROVING GYMNASTICS”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 11, 1, pp. 100-5, https://periodicals.karazin.ua/medicine/article/view/7157.