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https://www.world.rugby/development/player-numbers? lang=en
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https://amp.businessinsider.com/michael-calvin-shocking-sta-tistic-why-children-football-academies-will-never-succeed-soccer-sport-2017-6
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www.telegraph.co.uk/cricket/2019/01/18/solving-englands-batting-crisis-younger-brothers-could-key
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www.telegraph.co.uk/cricket/2019/01/18/solving-englands-batting-crisis-younger-brothers-could-key
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www.irishtimes.com/sport/other-sports/the-story-behind-the-incredible-ingebrigtsen-brothers-1.3593994
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www.theplayerstribune.com/en-us/articles/raheem-sterling-england-it-was-all-a-dream
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www.telegraph.co.uk/cricket/2019/01/18/solving-englands-batting-crisis-younger-brothers-could-key
24
worldathletics.org/news/feature/jakob-ingebrigtsen-european-championships-ber
25
www.european-athletics.org/competitions/european-athlet-ics-championships/news/article=filip-and-henrik-ingebrigtsen-bask-jakob-1500m-success-berlin/index.html
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worldathletics.org/news/feature/jakob-ingebrigtsen-european-championships-ber
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Sulloway F. J., Zweigenhaft R. L. Birth order and risk taking in athletics: a meta-analysis and study of Major League Baseball // Personality and Social Psychology Review. 4 (14). 2011. Р. 402–416.
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www.european-athletics.org/competitions/european-athlet-ics-championships/news/article=filip-and-henrik-ingebrigtsen-bask-jakob-1500m-success-berlin/index.html
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www.telegraph.co.uk/sport/cricket/international/southafrica/12062933/South-Africa-v-England-The-making-of-AB-de-Villiers.html; Trussell D. E., Shaw S. M. Organized youth sport and parenting in public and private spaces // Leisure Sciences. 5 (34). 2012. Р. 377–394.
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www.theplayerstribune.com/en-us/articles/raheem-sterling-england-it-was-all-a-dream
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Holt N. L., Pynn S., Pankow K., Neely K. C., Carson V., Ingstrup M. Family influences on active free play and sport. // Horn T. S., Smith A. L. (eds). Advances in Sport and Exercise Psychology. 4th edn. Champaign, IL: Human Kinetics, 2019. Р. 117–132.
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