Al Khalili M., Al Khalili S.M., and Chekalova E.V. 2023. “Daniil Medvedev’s Serve and Return Stability Average Percents at Tournaments in the Period of 2019-2023”. Theory and Practice of Physical Culture, no. 11 (November):39-41. http://tpf1610220.nichost.ru/index.php/TPPC/article/view/822.