@article{IM2_1982_18_3_a7,
     author = {A. N. Rudakov and I. R. Shafarevich},
     title = {On the degeneration of $K3$ surfaces over fields of finite characteristic},
     journal = {Izvestiya. Mathematics},
     pages = {561--574},
     year = {1982},
     volume = {18},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1982_18_3_a7/}
}