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Dicke, Theresa; Marsh, Herbert W.; Parker, Philip D.; Pekrun, Reinhard; Guo, Jiesi; Televantou, Ioulia (2018): Effects of School-Average Achievement on Individual Self-Concept and Achievement: Unmasking Phantom Effects Masquerading as True Compositional Effects. In: Journal of Educational Psychology, Vol. 110, No. 8: pp. 1112-1126