@article{CMUC_1994__35_3_a10,
     author = {Gutev, Valentin G.},
     title = {Continuous selections, $G_\delta $-subsets of {Banach} spaces and usco mappings},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {533--538},
     publisher = {mathdoc},
     volume = {35},
     number = {3},
     year = {1994},
     mrnumber = {1307280},
     zbl = {0840.54023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1994__35_3_a10/}
}