@article{10_14708_cm_v53i2_785,
     author = {Stefan Rolewicz},
     title = {On {/()X\)-convex} functions},
     journal = {Commentationes Mathematicae},
     pages = { 197\ensuremath{-}199},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {2013},
     doi = {10.14708/cm.v53i2.785},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v53i2.785/}
}