@article{MZM_2002_72_4_a3,
     author = {B. S. Kashin},
     title = {Lower {Bounds} for $n${-Term} {Approximations} of {Plane} {Convex} {Sets} and {Related} {Topics}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {509--515},
     publisher = {mathdoc},
     volume = {72},
     number = {4},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2002_72_4_a3/}
}