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Rethfeldt, S. James N. Karls, Karin E. Wandrei: PIE manual: Person — In — Environment system: The PIE classification system for social functioning problems. ZPS 3, 114–116 (2004). https://doi.org/10.1007/s11620-004-0029-9
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DOI: https://doi.org/10.1007/s11620-004-0029-9