%0 Journal Article %A A. N. Varchenko %A S. M. Gusein-Zade %T The topology of~caustics, wave fronts, and degeneracies of~critical points %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1984 %P 209-210 %V 39 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1984_39_2_a39/ %G en %F RM_1984_39_2_a39