%0 Journal Article %A V. A. Iskovskikh %T Birational properties of a~surface of degree~4 in~$\mathbf P^4_k$ %J Sbornik. Mathematics %D 1972 %P 30-36 %V 17 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1972_17_1_a1/ %G en %F SM_1972_17_1_a1