@article{10_14708_cm_v56i1_1142,
     author = {Pawe{\l} Foralewski and Karol Le\'snik and Lech Maligranda},
     title = {Some remarks on level functions and their applications},
     journal = {Commentationes Mathematicae},
     pages = { 55\ensuremath{-}86},
     publisher = {mathdoc},
     volume = {56},
     number = {1},
     year = {2016},
     doi = {10.14708/cm.v56i1.1142},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v56i1.1142/}
}