Geodesic
On a theorem of Holický and Zelený concerning Borel maps without $\sigma$-compact fibers
Czechoslovak Mathematical Journal, Tome 53 (2003) no. 3, pp. 535-543

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The paper is concerned with a recent very interesting theorem obtained by Holický and Zelený. We provide an alternative proof avoiding games used by Holický and Zelený and give some generalizations to the case of set-valued mappings.
Classification : 26A21, 28A05, 54C10, 54H05
Keywords: Borel maps; $\sigma $-compact sections; set-valued maps 
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     author = {Milewski, P. and Pol, R.},
     title = {On a theorem of {Holick\'y} and {Zelen\'y} concerning {Borel} maps without $\sigma$-compact fibers},
     journal = {Czechoslovak Mathematical Journal},
     pages = {535--543},
     publisher = {mathdoc},
     volume = {53},
     number = {3},
     year = {2003},
     mrnumber = {2000051},
     zbl = {1080.54511},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2003__53_3_a3/}
}
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Milewski, P.; Pol, R. On a theorem of Holický and Zelený concerning Borel maps without $\sigma$-compact fibers. Czechoslovak Mathematical Journal, Tome 53 (2003) no. 3, pp. 535-543. http://geodesic.mathdoc.fr/item/CMJ_2003__53_3_a3/