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During the period of this research, the authors were supported by the following grants, T. E. Cecil, NSF Grant no. MCS76-07044, P. J. Ryan, NSF Grant no. MCS76-06930
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Cecil, T.E., Ryan, P.J. Focal sets, taut embeddings and the cyclides of Dupin. Math. Ann. 236, 177–190 (1978). https://doi.org/10.1007/BF01351390
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DOI: https://doi.org/10.1007/BF01351390