%0 Journal Article %A D. D. Pervouchine %T Hierarchy of Closures of Matrix Pencils %J Journal of Lie Theory %D 2004 %P 443-479 %V 14 %N 2 %U http://geodesic.mathdoc.fr/item/JOLT_2004_14_2_a5/ %F JOLT_2004_14_2_a5