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Ulrich, Ralf - In: Zeitschrift für Bevölkerungswissenschaft : Demographie 32 (2007) 3/4, pp. 621-639

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Ulrich, Ralf - In: Global Change : causal structures and indicative solutions, (pp. 61-85). 2000

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Ulrich, Ralf - In: Geographische Rundschau 53 (2001) 2, pp. 51-54

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Ulrich, Ralf - In: The economic consequences of immigration to Germany, (pp. 61-80). 1994

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Ulrich, Ralf - In: The economic consequences of immigration to Germany, (pp. 21-43). 1994

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Ulrich, Ralf - In: Weltprobleme im 21. Jahrhundert, (pp. 21 - 51). 2001

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Ulrich, Ralf - 1990

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Steinmann, Gunter (ed.); Ulrich, Ralf (ed.) - 1994

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Ulrich, Ralf - 1991

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Münz, Rainer; Ulrich, Ralf - 1994

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