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المؤلفون: Gilberg, Reiner, Follmer, Robert, Engelhardt, Kai, Smid, Menno
الإتاحة: http://www.deutsche-digitale-bibliothek.de/item/DQDBHOTRM7WCS4NCGMVLDM2CGJGHTUYE
http://www.ssoar.info/ssoar/handle/document/12561
http://www.ssoar.info/ssoar/bitstream/handle/document/12561/ssoar-2003-follmer_et_al-mobilitat_in_deutschland_2002.pdf?sequence=1