@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/