Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1972_117_a13, 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}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1972_117_a13/} }
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/