%0 Journal Article %A O. V. Lyashko %T Classification of critical points of functions on a manifold with singular boundary %J Funkcionalʹnyj analiz i ego priloženiâ %D 1983 %P 28-36 %V 17 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1983_17_3_a3/ %G ru %F FAA_1983_17_3_a3