@article{JCA_1994_1_1_a2,
     author = {Y. Li and S. Shi},
     title = {Differentiability of {Convex} {Functions} on a {Banach} {Space} with {Smooth} {Bump} {Function}},
     journal = {Journal of convex analysis},
     pages = {047--06},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1994},
     url = {http://geodesic.mathdoc.fr/item/JCA_1994_1_1_a2/}
}