@article{SM_1982_41_3_a2,
     author = {V. E. Maiorov},
     title = {On linear widths of {Sobolev} classes and chains of extremal subspaces},
     journal = {Sbornik. Mathematics},
     pages = {361--382},
     publisher = {mathdoc},
     volume = {41},
     number = {3},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1982_41_3_a2/}
}