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Hagger, Martin, Chatzisarantis, Nikos, Hein, Vello, Pihu, M, Soos, Istvan, Karsai, Istvan, Lintunen, Taru and Leemans, Sofie (2009) Teacher, peer and parent autonomy support in physical education and leisure-time physical activity: a trans-contextual model of motivation in four nations. Psychology and Health, 24 (6). pp. 689-711. ISSN 0887-0446