TY - JOUR AU - Hsiang, Fu Cheng TI - On the absolute convergence factors of an orthogonal series JO - Portugaliae mathematica PY - 1977 SP - 13 EP - 15 VL - 36 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/PORMA_1977__36_1_115297/ LA - en ID - PORMA_1977__36_1_115297 ER -