@article{MZM_1998_64_6_a5,
     author = {A. V. Domrina and S. Yu. Orevkov},
     title = {On four-sheeted polynomial mappings of $\mathbb C^2$. {I.} {The} case of an irreducible ramification curve},
     journal = {Matemati\v{c}eskie zametki},
     pages = {847--862},
     publisher = {mathdoc},
     volume = {64},
     number = {6},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_64_6_a5/}
}