Geodesic
On three-sheeted polynomial mappings of~$\mathbf C^2$
Izvestiya. Mathematics , Tome 29 (1987) no. 3, pp. 587-596

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It is proved that the Jacobian of a $3$-sheeted polynomial mapping $\mathbf C^2\to\mathbf C^2$ cannot be a constant. Bibliography: 8 titles. 
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     author = {S. Yu. Orevkov},
     title = {On three-sheeted polynomial mappings of~$\mathbf C^2$},
     journal = {Izvestiya. Mathematics },
     pages = {587--596},
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     volume = {29},
     number = {3},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1987_29_3_a4/}
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S. Yu. Orevkov. On three-sheeted polynomial mappings of~$\mathbf C^2$. Izvestiya. Mathematics , Tome 29 (1987) no. 3, pp. 587-596. http://geodesic.mathdoc.fr/item/IM2_1987_29_3_a4/