@article{1077468774,
author = {Michael, E.},
title = {A theorem on semi-continuous set-valued functions},
journal = {Duke Math. J.},
volume = {26},
number = {1},
year = {1959},
pages = { 647-651},
language = {en},
url = {http://dml.mathdoc.fr/item/1077468774}
}
Michael, E. A theorem on semi-continuous set-valued functions. Duke Math. J., Tome 26 (1959) no. 1, pp. 647-651. http://gdmltest.u-ga.fr/item/1077468774/