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2. Engelsted, N. (1989a). The general foundation of personality, Vol. I & II [in Danish]. Aarhus: Aarhus Universitetsforlag.
3. Engelsted, N. (1989b): What is the psyche and how did it get into the world, In: Engelsted, Niels, Lars Hem, & Jens Mammen (Eds.), Essays in general psychology. Seven Danish contributions (pp. 13–48), Aarhus: Aarhus University Press.
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