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المؤلفون: Heinze, Rolf G.
المساهمون: Meffert, Heribert, Steinbrück, Peer
المصدر: Trend book NRW: Perspectives of a Metropolitan Region
Trendbuch NRW : Perspektiven einer Metropolregionالإتاحة: http://www.deutsche-digitale-bibliothek.de/item/VCVOESFKVAWISQPY5W2MQOQN4MP5Q7V2
http://www.ssoar.info/ssoar/handle/document/12119
http://www.ssoar.info/ssoar/bitstream/handle/document/12119/ssoar-2005-heinze-das_demographische_laboratorium.pdf?sequence=1