Geodesic
Direct and inverse theorems of approximation theory for functions on Lobachevsky space
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part 14, Tome 194 (1992), pp. 120-147.

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     author = {P. I. Lizorkin},
     title = {Direct and inverse theorems of approximation theory for functions on {Lobachevsky} space},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {120--147},
     publisher = {mathdoc},
     volume = {194},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1992_194_a8/}
}
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P. I. Lizorkin. Direct and inverse theorems of approximation theory for functions on Lobachevsky space. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part 14, Tome 194 (1992), pp. 120-147. http://geodesic.mathdoc.fr/item/TM_1992_194_a8/