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@article{DAN_1987_296_2_a2, author = {P. I. Lizorkin and S. M. Nikol'skii}, title = {Symmetric averaged differences on a sphere}, journal = {Doklady Akademii Nauk}, pages = {271--274}, publisher = {mathdoc}, volume = {296}, number = {2}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1987_296_2_a2/} }
P. I. Lizorkin; S. M. Nikol'skii. Symmetric averaged differences on a sphere. Doklady Akademii Nauk, Tome 296 (1987) no. 2, pp. 271-274. http://geodesic.mathdoc.fr/item/DAN_1987_296_2_a2/