@article{10_4064_cm_19_2_285_293,
     author = {Czes{\l}aw Olech},
     title = {Approximation of set-valued functions by continuous functions},
     journal = {Colloquium Mathematicum},
     pages = {285--293},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1968},
     doi = {10.4064/cm-19-2-285-293},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-19-2-285-293/}
}