MathSciNet bibliographic data MR1266755 57M20 (57Q35) Freedman, Michael H.; Krushkal, Vyacheslav S.; Teichner, Peter van Kampen's embedding obstruction is incomplete for $2$$2$-complexes in ${\bf R}^4$${\bf R}^4$. Math. Res. Lett. 1 (1994), no. 2, 167–176. Article

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