Samkova, O. ., T. . Fendel, and S. . Zubkova. “Assessment of the Effectiveness of the Application of Isometric Exercises in the Special Strength Preparation of Qualified Volleyball Players”. Theory and Practice of Physical Culture, no. 8, Sept. 2026, pp. 26-29, http://tpfk.ru/index.php/TPPC/article/view/1747.