%0 Journal Article %A V. A. Iskovskikh %A S. L. Tregub %T Relations in the two-dimensional Cremona group over a~nonclosed field %J Informatics and Automation %D 1994 %P 123-152 %V 207 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1994_207_a10/ %G ru %F TRSPY_1994_207_a10