TY - JOUR AU - V. S. Medvedev TI - The bifurcation of the ``blue sky catastrophe'' on two-dimensional manifolds JO - Matematičeskie zametki PY - 1992 SP - 118 EP - 125 VL - 51 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1992_51_1_a13/ LA - ru ID - MZM_1992_51_1_a13 ER -