@article{SM_1994_79_2_a1,
     author = {V. E. Maiorov},
     title = {Kolmogorov's $(n,\delta)$-widths of spaces of smooth functions},
     journal = {Sbornik. Mathematics},
     pages = {265--279},
     publisher = {mathdoc},
     volume = {79},
     number = {2},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1994_79_2_a1/}
}