%0 Journal Article %A Costa, Cecília %A Serôdio, Rogério %T A footnote on quaternion block-tridiagonal systems %J Electronic transactions on numerical analysis %D 1999 %P 53-55 %V 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_1999__9__a8/ %G en %F ETNA_1999__9__a8