@article{1103044457, author = {Dvoretzky, Aryeh}, title = {A converse of Helly's theorem on convex sets.}, journal = {Pacific J. Math.}, volume = {5}, number = {4}, year = {1955}, pages = { 345-350}, language = {en}, url = {http://dml.mathdoc.fr/item/1103044457} }
Dvoretzky, Aryeh. A converse of Helly's theorem on convex sets.. Pacific J. Math., Tome 5 (1955) no. 4, pp. 345-350. http://gdmltest.u-ga.fr/item/1103044457/