MathSciNet bibliographic data MR546098 (81b:57009) 57N12 (55P55) Coram, D. S.; Duvall, P. F., Jr. Mappings from \$S\sp{3}\$$S\sp{3}$ to \$S\sp{2}\$$S\sp{2}$ whose point inverses have the shape of a circle. General Topology Appl. 10 (1979), no. 3, 239–246. Links to the journal or article are not yet available

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