Rzhanov A.A., Lebedinsky V.Yu., Akhmatgatin A.A., and Yani A.V. “DEVELOPMENT OF SPECIAL FLEXIBILITY IN VOLLEYBALL PLAYERS”. Theory and Practice of Physical Culture, no. 8 (August 6, 2023): 18–21. Accessed May 12, 2024. http://tpfk.ru/index.php/TPPC/article/view/699.