%0 Journal Article %A SkrzyƄski, Marcin %T On a singular set for the restriction of the characteristic map to a linear subspace of $\Cal M_n$ %J Mathematica slovaca %D 2004 %P 229-236 %V 54 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_2004__54_3_a2/ %G en %F MASLO_2004__54_3_a2