@article{TM_1989_189_a9,
     author = {V. T. Shevaldin},
     title = {Lower bounds on widths of classes of sourcewise representable functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {185--200},
     publisher = {mathdoc},
     volume = {189},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1989_189_a9/}
}