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[B]Thomas F. Banchoof. Triple points and surgery of immersed surfaces, Proc. A.M.S., Vol. 46 No. 3 Dec 1974.
[W]H. Whitney. On the Topology of Differentiable Manifolds, Lectures in Topology, Mich. Univ. Press, 1940.
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The author is partially supported by an NSF grant.
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Freedman, M.H. Quadruple points of 3-manifolds inS 4 . Commentarii Mathematici Helvetici 53, 385–394 (1978). https://doi.org/10.1007/BF02566085
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DOI: https://doi.org/10.1007/BF02566085