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(2010-09-10). "Impressum & Haftungsausschluss". Immobilien Rhein-Ruhr.

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(2010-09-10). "Infoservice". Immobilien Rhein-Ruhr.

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Prof. Dr. Leonard Blussé (2011-10-26). “A Great Divergence?: The Lower Yangzi and Rhine Deltas Compared” (in en) (PDF). Georgia State University. Retrieved on 2011-10-18.