“The Influence of Swimming with Aqua Fitness Elements and Interval Hypoxic Training on the Function of External Spirit of Girls of 11–12 Years”, Fiz. vihov. sport kul’t. zdor. suchas. susp., no. 2(46), pp. 99–104, Jun. 2019, doi: 10.29038/2220-7481-2019-02-99-104.