TY - JOUR AU - V. A. Iskovskikh TI - Birational properties of a~surface of degree~4 in~$\mathbf P^4_k$ JO - Sbornik. Mathematics PY - 1972 SP - 30 EP - 36 VL - 17 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1972_17_1_a1/ LA - en ID - SM_1972_17_1_a1 ER -