TY - JOUR AU - V. T. Fomenko TI - Classification of Two-Dimensional Surfaces with Zero Normal Torsion in Four-Dimensional Spaces of Constant Curvature JO - Matematičeskie zametki PY - 2004 SP - 744 EP - 756 VL - 75 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_2004_75_5_a10/ LA - ru ID - MZM_2004_75_5_a10 ER -