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This research was performed in part while the authors attended Workshops on Design Theory and Coding Theory at the Institute for Mathematics and its Applications, University of Minnesota, Minneapolis, Minnesota, June 1988. The authors were partially supported at the Institute with funds provided by the National Science Foundation.
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McFarland, R.L., Ma, S.L. Abelian difference sets with multiplier minus one. Arch. Math 54, 610–623 (1990). https://doi.org/10.1007/BF01188691
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DOI: https://doi.org/10.1007/BF01188691