@article{1077375085, author = {Libera, Richard J.}, title = {Some radius of convexity problems}, journal = {Duke Math. J.}, volume = {31}, number = {1}, year = {1964}, pages = { 143-158}, language = {en}, url = {http://dml.mathdoc.fr/item/1077375085} }
Libera, Richard J. Some radius of convexity problems. Duke Math. J., Tome 31 (1964) no. 1, pp. 143-158. http://gdmltest.u-ga.fr/item/1077375085/