%0 Journal Article %A Ishibashi, Hiroyuki %T Involutions and semiinvolutions %J Czechoslovak Mathematical Journal %D 2006 %P 533-541 %V 56 %N 2 %U http://geodesic.mathdoc.fr/item/CMJ_2006_56_2_a18/ %G en %F CMJ_2006_56_2_a18