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Sack, H.G. Jahreskongreß der North American Society for the Psychology of Sport and Physical Activity (NASPA) am 27. und 28. März 1974 in Anaheim (California, Los Angeles area). Sportwiss 4, 212–215 (1974). https://doi.org/10.1007/BF03178837
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DOI: https://doi.org/10.1007/BF03178837