@article{RM_1989_44_5_a10,
     author = {A. I. Kamzolov},
     title = {On~the {Kolmogorov} diameters of classes of smooth functions on a sphere},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {196--197},
     publisher = {mathdoc},
     volume = {44},
     number = {5},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1989_44_5_a10/}
}