Geodesic
Direct and inverse theorems of approximation theory for functions on Lobachevsky space
Informatics and Automation, 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 = {Informatics and Automation},
     pages = {120--147},
     publisher = {mathdoc},
     volume = {194},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1992_194_a8/}
}
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P. I. Lizorkin. Direct and inverse theorems of approximation theory for functions on Lobachevsky space. Informatics and Automation, 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/TRSPY_1992_194_a8/