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              Blossfeld, H.-P. and R. Stockmann (1999). 'The German Dual System in Comparative Perspective.' International Journal of Sociology 28(4): 3-28.
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              Blossfeld, H.-P. und Stockmann, R. (1998/99): The German dual system in comparative per- spective. In: International Journal of Sociology 28: 3-28.
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              Blossfeld, H.-P., & Stockmann, R. (1999). The German dual system in comparative perspective. International Journal of Sociology, 28, 3-28.
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