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The work of William Huebsch on this paper was supported in part by a grant from the National Science Foundation, NSF-G19884.
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Huebsch, W., Morse, M. Analytic diffeomorphisms approximatingC m-diffeomorphisms. Rend. Circ. Mat. Palermo 11, 25–46 (1962). https://doi.org/10.1007/BF02849424
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DOI: https://doi.org/10.1007/BF02849424