@article{TIMM_2012_18_4_a23,
     author = {Yu. N. Subbotin},
     title = {One-sided widths of classes of smooth functions},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {267--270},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2012_18_4_a23/}
}