%0 Journal Article %A Janovská, Drahoslava %A Opfer, Gerhard %T Fast Givens transformation for quaternion valued matrices applied to Hessenberg reductions %J Electronic transactions on numerical analysis %D 2005 %P 1-26 %V 20 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_2005__20__a15/ %G en %F ETNA_2005__20__a15