Estimates for bilinear approximations of the classes $ S_{{p,\theta}}^{\varOmega }B $ of periodic functions of two variables
2013 ◽
Vol 64
(8)
◽
pp. 1260-1276
◽
Keyword(s):
1926 ◽
Vol 5
(1-4)
◽
pp. 201-236
◽
1994 ◽
Vol 09
(27)
◽
pp. 2515-2526
◽