%0 Journal Article %A Sulaiman, W.T. %T Characterization for relations on some summability methods. %J Portugaliae mathematica %D 1999 %P 273-280 %V 56 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1999__56_3_48412/ %G en %F PORMA_1999__56_3_48412