@article{IM2_2010_74_1_a1,
     author = {V. N. Konovalov and V. E. Maiorov},
     title = {Widths of some classes of convex functions and bodies},
     journal = {Izvestiya. Mathematics},
     pages = {127--150},
     year = {2010},
     volume = {74},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2010_74_1_a1/}
}