References
L. Janos, A Converse of Banach's Contraction Theorem. Proc. Amer. Math. Soc.18, 287–289 (1967).
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Janos, L. A converse of the generalized Banach's contraction theorem. Arch. Math 21, 69–71 (1970). https://doi.org/10.1007/BF01220881
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DOI: https://doi.org/10.1007/BF01220881