@article{RRACEFN_1993_1993_1_a0,
     author = {Valdivia, M.},
     title = {Boundaries of convex sets.},
     journal = {Revista de la Real Academia de Ciencias Exactas, F{\'\i}sicas y Naturales},
     pages = {177-183},
     year = {1993},
     volume = {87},
     number = {2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RRACEFN_1993_1993_1_a0/}
}