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Zamfirescu, T. Fixpunkt- und Kontraktionssätze in metrischen Räumen (Fixed Point and Contraction Theorems in Metric Spaces). Aeq. Math. 9, 311–312 (1973). https://doi.org/10.1007/BF01832657
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DOI: https://doi.org/10.1007/BF01832657