[Beginnings and development of performance motivation: (I). In competition in small children].

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@article{Heckhausen1962BeginningsAD, title={[Beginnings and development of performance motivation: (I). In competition in small children].}, author={Heinz Heckhausen and I ROELOFSEN}, journal={Psychologische Forschung}, year={1962}, volume={26}, pages={313-97} }