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Dedicated to Professor Dr.L. Collatz for the occasion of his 60th birthday. This research was supported by the Air Force Office of Scientific Research and by the United States Army under Contract No. DA-31-124-ARO-D-462.
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Goldstein, A.A., Hobby, C. An inverse function theorem. Abh.Math.Semin.Univ.Hambg. 36, 136–139 (1971). https://doi.org/10.1007/BF02995916
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DOI: https://doi.org/10.1007/BF02995916