References 1 - 6 for Psychologie: Lächeln, bitte!
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[1] GEO Magazin Nr. 11/15 - Mission Mars - Eine Reise an die Grenzen des Möglichen
[2] › Bestellen
[3] › Abonnieren
[4] › iPad-App
[5] Ein Lächeln im Großen Bären (Foto von: X-ray - NASA / CXC / J. Irwin et al.)
[6] GEO GEO im Abo
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