@article{TM_1993_204_a9,
     author = {P. I. Lizorkin and Kh. P. Rustamov},
     title = {Nikol'skij{\textendash}Besov spaces on the sphere in connection with approximation theory},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {172--200},
     year = {1993},
     volume = {204},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1993_204_a9/}
}