TY - JOUR TI - Necessary conditions with almost monotone sequences about orthogonal series T3 - Acta scientiarum mathematicarum AU - Leindler László PY - 2004 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/16057/1/math_070_numb_003_004_695-702.pdf ER -