Geodesic
On four-sheeted polynomial mappings of $\mathbb C^2$. II. The general case
Izvestiya. Mathematics, Tome 64 (2000) no. 1, pp. 1-33 
A. V. Domrina. On four-sheeted polynomial mappings of $\mathbb C^2$. II. The general case. Izvestiya. Mathematics, Tome 64 (2000) no. 1, pp. 1-33. http://geodesic.mathdoc.fr/item/IM2_2000_64_1_a0/
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper we prove that there are no four-sheeted polynomial mappings of $\mathbb C^2$ into itself whose Jacobian is a non-zero constant.

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