@article{GDZPPN000462241, title = {Widths of Nonnegatively Curved Spaces.}, journal = {Geometric and functional analysis}, volume = {5}, year = {1995}, pages = {445-463}, zbl = {0845.53031}, url = {http://dml.mathdoc.fr/item/GDZPPN000462241} }
Perelman, G. Widths of Nonnegatively Curved Spaces.. Geometric and functional analysis, Tome 5 (1995) pp. 445-463. http://gdmltest.u-ga.fr/item/GDZPPN000462241/