@article{JCA_1995_2_1-2_a7,
     author = {F. H. Clarke and R. J. Stern and P. R. Wolenski},
     title = {Proximal {Smoothness} and the {Lower-C\protect\textsuperscript{2}} {Property}},
     journal = {Journal of convex analysis},
     pages = {117--144},
     publisher = {mathdoc},
     volume = {2},
     number = {1-2},
     year = {1995},
     url = {http://geodesic.mathdoc.fr/item/JCA_1995_2_1-2_a7/}
}