Tsagelnikova AA, Boyarina YS, Tsiganov OV. THE STUDY OF MENTAL STATES TENNIS PLAYERS OF VARYING QUALIFICATIONS DURING THE COMPETITION. Mod. Psych. [Internet]. 2019 Sep. 27 [cited 2024 Nov. 14];2(3 (5):227-32. Available from: https://pub.ysu.am/index.php/modern-psychology/article/view/Vol.2_No.2%285%29_2019_pp.227-232