TY - JOUR AU - A. A. Borisenko TI - Surfaces with Chern--Lashof absolute curvature equal to the area of the Grassman image JO - Matematičeskie zametki PY - 1989 SP - 9 EP - 11 VL - 46 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1989_46_3_a1/ LA - ru ID - MZM_1989_46_3_a1 ER -