Sharp estimates of the widths of convolution classes in the space $C_{2\pi}$
Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 148-149.

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@article{TRSPY_1987_180_a86,
     author = {A. K. Kushpel'},
     title = {Sharp estimates of the widths of convolution classes in the space $C_{2\pi}$},
     journal = {Informatics and Automation},
     pages = {148--149},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a86/}
}
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A. K. Kushpel'. Sharp estimates of the widths of convolution classes in the space $C_{2\pi}$. Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 148-149. http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a86/