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MR546098
(81b:57009)
57N12
(55P55)
Coram, D. S.; Duvall, P. F., Jr. Mappings from $S\sp{3}$ to $S\sp{2}$ whose point inverses have the shape of a circle. General Topology Appl. 10 (1979), no. 3, 239–246. |
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