@article{106307, author = {Josef Dane\v s}, title = {On the radius of a set in a Hilbert space}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {025}, year = {1984}, pages = {355-362}, zbl = {0568.46018}, mrnumber = {768823}, language = {en}, url = {http://dml.mathdoc.fr/item/106307} }
Daneš, Josef. On the radius of a set in a Hilbert space. Commentationes Mathematicae Universitatis Carolinae, Tome 025 (1984) pp. 355-362. http://gdmltest.u-ga.fr/item/106307/
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