@article{JCA_2003_10_1_JCA_2003_10_1_a10,
     author = {Z.-Q. Xia and M.-Z. Wang and L.-W. Zhang},
     title = {Directional {Derivative} of a {Class} of {Set-Valued} {Mappings} and its {Applications}},
     journal = {Journal of convex analysis},
     pages = {211--227},
     year = {2003},
     volume = {10},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JCA_2003_10_1_JCA_2003_10_1_a10/}
}