Approximation on a~hyperboloid in the $L_2$-metric
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. 215-228.

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@article{TM_1992_194_a13,
     author = {I. V. Petrova},
     title = {Approximation on a~hyperboloid in the $L_2$-metric},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {215--228},
     publisher = {mathdoc},
     volume = {194},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1992_194_a13/}
}
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I. V. Petrova. Approximation on a~hyperboloid in the $L_2$-metric. 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. 215-228. http://geodesic.mathdoc.fr/item/TM_1992_194_a13/