The study of certain classes of functions by means of ``angular''' approximation
Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part IV, Tome 117 (1972), pp. 256-291.

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     author = {M. K. Potapov},
     title = {The study of certain classes of functions by means of ``angular''' approximation},
     journal = {Informatics and Automation},
     pages = {256--291},
     publisher = {mathdoc},
     volume = {117},
     year = {1972},
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     url = {http://geodesic.mathdoc.fr/item/TRSPY_1972_117_a13/}
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M. K. Potapov. The study of certain classes of functions by means of ``angular''' approximation. Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part IV, Tome 117 (1972), pp. 256-291. http://geodesic.mathdoc.fr/item/TRSPY_1972_117_a13/