TY - JOUR AU - Sulaiman, W.T. TI - Characterization for relations on some summability methods. JO - Portugaliae mathematica PY - 1999 SP - 273 EP - 280 VL - 56 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/PORMA_1999__56_3_48412/ LA - en ID - PORMA_1999__56_3_48412 ER -