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5. Ahrendt, H., Clauer, N., Hunziker, J.C., Weber, K., 1983. Migration of folding and metamorphism in the Rheinische Schiefergebirge deduced from K–Ar and Rb–Sr age determinations. In: Martin, H., Eder, F.W. (Eds.), Intracontinental Fold-and-Thrust-Belts. Springer, Berlin, pp. 323–338.