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This paper has been prepared under Contract Nonr 710 (54) between the University of Minnesota and the Office of Naval Research.
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Nitsche, J.C.C. A supplement to the condition of J. Douglas. Rend. Circ. Mat. Palermo 13, 192–198 (1964). https://doi.org/10.1007/BF02849527
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DOI: https://doi.org/10.1007/BF02849527