TY - JOUR AU - A. Kasperski TI - Modular approximation in \(X_\varphi^1\) by a filtered family of sublinear operators and convex operators JO - Commentationes Mathematicae PY - 1991 SP - 331 EP - 334 VL - 30 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v30i2.6320/ DO - 10.14708/cm.v30i2.6320 LA - pl ID - 10_14708_cm_v30i2_6320 ER -