TY - JOUR AU - Vanda Fülöp TI - Double sine series with nonnegative coefficients and Lipschitz classes JO - Colloquium Mathematicum PY - 2006 SP - 25 EP - 34 VL - 105 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm105-1-3/ DO - 10.4064/cm105-1-3 LA - en ID - 10_4064_cm105_1_3 ER -