Хорошуха Михайло Федорович (Mykhailo K. “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, no. 6(50), Dec. 2015, pp. 182-7, doi:10.15391/snsv.2015-6.034.