@article{MZ_1985__189_173583,
     author = {J.E. Jayne and R.W. Hansell and I. Labuda},
     title = {Boundaries of and {Selectors} for {Upper} {Semi-Continuous} {Multi-Valued} {Maps.}},
     journal = {Mathematische Zeitschrift},
     pages = {297--318},
     publisher = {mathdoc},
     volume = {189},
     year = {1985},
     zbl = {0544.54016},
     url = {http://geodesic.mathdoc.fr/item/MZ_1985__189_173583/}
}