@article{10_14708_cm_v25i2_6141,
     author = {A. Spakowski},
     title = {On approximation by step multifunctions},
     journal = {Commentationes Mathematicae},
     pages = { 363--371},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {1985},
     doi = {10.14708/cm.v25i2.6141},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v25i2.6141/}
}