@article{TRSPY_1985_172_a18,
     author = {S. M. Nikol'skii and P. I. Lizorkin},
     title = {Approximation theory on the sphere},
     journal = {Informatics and Automation},
     pages = {272--279},
     publisher = {mathdoc},
     volume = {172},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1985_172_a18/}
}