00652naa#a2200193#i#450# EN\INFRA-M\bibl\34753 20240424225156.3 2500-0489 20191225b2019####ek#y0engy0150####ca RU Health-saving education as a factor of additional education of children Journal article Moscow INFRA-M Academic Publishing LLC. 2019 5 с. Journal article local Общие вопросы математических и естественных наук. 50 Shpet V. V. Ovchinnikov Yu. D. Yakunina V. A. naukaru.ru