@article{10_14708_cm_v8i1_5507,
     author = {J. Musia{\l}ek},
     title = {Uog\'olnienie twierdzenia {Ossermana} dotycz\k{a}cego nier\'owno\'sci r\'o\.zniczkowej {\ensuremath{\Delta}u} \ensuremath{\geq} f(u)},
     journal = {Commentationes Mathematicae},
     pages = { 21--31},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1963},
     doi = {10.14708/cm.v8i1.5507},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v8i1.5507/}
}