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Хорошуха Михайло Федорович (Mykhailo K. 2015. Spiritual and salutary effects of tempering of young athletes by the nature on the system of Porfiry Ivanov (as from the twenty-five years of experience of the author). Slobozhanskyi Herald of Science and Sport. 6(50) (Dec. 2015), 182–187. DOI:https://doi.org/10.15391/snsv.2015-6.034.