00789naa#a2200181#i#450# EN\\bibl\106858 20260206174947.5 1994-4683 20260129b2026####ek#y0engy0150####ca RU Methodological approaches to developing speed-strength abilities in primary schoolchildren with mental retardation in physical education classes Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2026 6 с. Journal article local Воспитание, образование и обучение особых групп лиц. 376 Snigur Marina Evgen'evna Setyaeva Natal'ya Nikolaevna uchzapiski.lesgaft.spb.ru