MathSciNet bibliographic data MR505553 57R42 (55Q10 55Q25 58C27) Freedman, Michael H. Quadruple points of \$3\$$3$-manifolds in \$S\sp{4}\$$S\sp{4}$. Comment. Math. Helv. 53 (1978), no. 3, 385–394. Article

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