%0 Journal Article %A Bürgisser, Peter %T On the Structure of Valiant's Complexity Classes %J Discrete mathematics & theoretical computer science %D 1998-1999 %V 3 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.260/ %R 10.46298/dmtcs.260 %G en %F DMTCS_1999_3_3_a3