Geodesic
On four-sheeted polynomial mappings of~$\mathbb C^2$. II. The general case
Izvestiya. Mathematics , Tome 64 (2000) no. 1, pp. 1-33.

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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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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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