@article{IM2_2015_79_5_a5,
     author = {Vik. S. Kulikov},
     title = {Dualizing coverings of the plane},
     journal = {Izvestiya. Mathematics},
     pages = {1013--1042},
     year = {2015},
     volume = {79},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2015_79_5_a5/}
}