@article{10_4153_CMB_1980_002_9,
     author = {Gregory, David A.},
     title = {Upper {Semi-Continuity} of {Subdifferential} {Mappings}},
     journal = {Canadian mathematical bulletin},
     pages = {11--19},
     year = {1980},
     volume = {23},
     number = {1},
     doi = {10.4153/CMB-1980-002-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1980-002-9/}
}