@article{JCA_2009_16_3_JCA_2009_16_3_a22,
     author = {J. P. Moreno and A. Seeger},
     title = {External {Analysis} of {Boundary} {Points} of {Convex} {Sets:} {Supporting} {Cones} and {Drops}},
     journal = {Journal of convex analysis},
     pages = {939--957},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2009},
     url = {http://geodesic.mathdoc.fr/item/JCA_2009_16_3_JCA_2009_16_3_a22/}
}