@article{GDZPPN00243055X,
title = {Boundaries of and Selectors for Upper Semi-Continuous Multi-Valued Maps.},
journal = {Mathematische Zeitschrift},
volume = {189},
year = {1985},
pages = {297-318},
zbl = {0544.54016},
url = {http://dml.mathdoc.fr/item/GDZPPN00243055X}
}
Jayne, J.E.; Hansell, R.W.; Labuda, I. Boundaries of and Selectors for Upper Semi-Continuous Multi-Valued Maps.. Mathematische Zeitschrift, Tome 189 (1985) pp. 297-318. http://gdmltest.u-ga.fr/item/GDZPPN00243055X/