@article{RM_1983_38_4_a6,
     author = {V. M. Tikhomirov},
     title = {Widths and entropy},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {101--111},
     publisher = {mathdoc},
     volume = {38},
     number = {4},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1983_38_4_a6/}
}