@article{IM2_1994_42_3_a0,
     author = {V. A. Iskovskikh and F. K. Kabdikairov and S. L. Tregub},
     title = {Relations in the two-dimensional {Cremona} group over a perfect field},
     journal = {Izvestiya. Mathematics },
     pages = {427--478},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1994_42_3_a0/}
}