Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1967_172_2_a11, author = {S. Ya. Havinson}, title = {Approximation by elements of convex sets}, journal = {Doklady Akademii Nauk}, pages = {294--297}, publisher = {mathdoc}, volume = {172}, number = {2}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_2_a11/} }
S. Ya. Havinson. Approximation by elements of convex sets. Doklady Akademii Nauk, Tome 172 (1967) no. 2, pp. 294-297. http://geodesic.mathdoc.fr/item/DAN_1967_172_2_a11/