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This paper was prepared under Contract Nonr-710(16) between the University of Minnesota and the Office of Naval Research.
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Nitsche, J.C.C. On the constant of E. Heinz. Rend. Circ. Mat. Palermo 8, 178–181 (1959). https://doi.org/10.1007/BF02851029
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DOI: https://doi.org/10.1007/BF02851029