Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1990_47_2_a16, author = {V. P. Fonf}, title = {Strongly antiproximinal sets in {Banach} spaces}, journal = {Matemati\v{c}eskie zametki}, pages = {130--136}, publisher = {mathdoc}, volume = {47}, number = {2}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_2_a16/} }
V. P. Fonf. Strongly antiproximinal sets in Banach spaces. Matematičeskie zametki, Tome 47 (1990) no. 2, pp. 130-136. http://geodesic.mathdoc.fr/item/MZM_1990_47_2_a16/