@article{Kovtunenko2026showdown,
author={Kovtunenko, T.D. and Eydel'man, L.N.},
title={Showdown matches under tennis rules as a training methodology},
journal={Scientific notes of P. F. Lesgaft University},
publisher={National State University of Physical Education, Sports and Health named after P.F. Lesgaft},
year={2026},
pages={147-154},
volume={0},
issue={5},
}