%0 Journal Article %A Janovská, Drahoslava %A Opfer, Gerhard %T Zeros and singular points for one-sided coquaternionic polynomials with an extension to other \(R^4\) algebras %J Electronic transactions on numerical analysis %D 2014 %P 133-158 %V 41 %U http://geodesic.mathdoc.fr/item/ETNA_2014__41__a17/ %G en %F ETNA_2014__41__a17