Tsagelnikova , A. A.; Boyarina , Y. S.; Tsiganov , O. V. THE STUDY OF MENTAL STATES TENNIS PLAYERS OF VARYING QUALIFICATIONS DURING THE COMPETITION. Mod. Psych. 2019, 2 (3 (5), 227-232. https://doi.org/10.46991/SBMP/2019.2.2(5).227.