@article{IM2_1977_11_1_a2,
     author = {M. Kh. Gizatullin and V. I. Danilov},
     title = {Automorphisms of affine {surfaces.~II}},
     journal = {Izvestiya. Mathematics},
     pages = {51--98},
     year = {1977},
     volume = {11},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1977_11_1_a2/}
}