TY - JOUR AU - A. N. Kurbatskii TI - Singularities of the transitivity zone of surfaces with boundaries in~$\mathbb R^3$ JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 2010 SP - 583 EP - 585 VL - 65 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_2010_65_3_a7/ LA - en ID - RM_2010_65_3_a7 ER -