TY - JOUR AU - S. M. Natanzon TI - A~topological classification of a~pair of spinor forms on surfaces JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1992 SP - 265 EP - 266 VL - 47 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1992_47_1_a10/ LA - en ID - RM_1992_47_1_a10 ER -