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Gerlach, Erin (2007). Sport-involvement and development during childhood. A longitudinal study on frame of reference effects on physical self-concept. In: Diniz, J.; Carreiro da Costa, F.; Onofre, M. (eds.) Active lifestyles: The impact of education and sport (pp. 121-129). Lisbon: Faculdade de Motricidade Humana, Universidade Técnica Lisboa
