TY - JOUR AU - Stefan Rolewicz TI - On /()X\)-convex functions JO - Commentationes Mathematicae PY - 2013 SP - 197−199 VL - 53 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v53i2.785/ DO - 10.14708/cm.v53i2.785 LA - pl ID - 10_14708_cm_v53i2_785 ER -