Geodesic
Certain examples in connection with problems about polynomial transformations of~$C^n$
Izvestiya. Mathematics , Tome 5 (1971) no. 2, pp. 278-288.

Voir la notice de l'article provenant de la source Math-Net.Ru

An example is constructed of a threefold covering of four-dimensional space with regular part which is contractible and bifurcation curve homeomorphic to a two-dimensional plane. 
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A. G. Vitushkin. Certain examples in connection with problems about polynomial transformations of~$C^n$. Izvestiya. Mathematics , Tome 5 (1971) no. 2, pp. 278-288. http://geodesic.mathdoc.fr/item/IM2_1971_5_2_a1/