@article{JCA_1997_4_2_a12,
     author = {M. L. Radulescu and F. H. Clarke},
     title = {Geometric {Approximation} of {Proximal} {Normals}},
     journal = {Journal of convex analysis},
     pages = {373--38},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1997},
     url = {http://geodesic.mathdoc.fr/item/JCA_1997_4_2_a12/}
}