Khairullin, R., D. Yelistratov, N. Ishmukhametova, S. Ilyin, and D. Khairullin. “THE DYNAMICS OF CARDIAC PUMPING PERFORMANCE DEPENDING ON RESPIRATORY CYCLES AND INCREASING LOAD”. Human. Sport. Medicine, Vol. 22, no. 3, Dec. 2022, pp. 30-37, doi:10.14529/hsm220304.