@article{RM_1960_15_3_a1,
     author = {V. M. Tikhomirov},
     title = {Diameters of sets in function spaces and the theory of best approximations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {75--111},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1960},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_3_a1/}
}