00654naa#a2200181#i#450# EN\\bibl\115759 20260527042059.3 1994-4683 20260526b2026####ek#y0engy0150####ca RU Showdown matches under tennis rules as a training methodology Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2026 7 с. Journal article local Настольный теннис. 796.386 Kovtunenko Tat'yana Dmitrievna Eydel'man Lyubov' Nikolaevna uchzapiski.lesgaft.spb.ru