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المؤلفون: Ernst, Stefanie
المصدر: ZÖSS Discussion Paper (10)
الإتاحة: http://www.ssoar.info/ssoar/handle/document/11362
http://www.ssoar.info/ssoar/bitstream/handle/document/11362/ssoar-2006-ernst-freelancer.pdf?sequence=1
http://www.deutsche-digitale-bibliothek.de/item/3TCBXRXTDLF7QZ3SYT5I5MWMR6N3TBBC