Approximation by Fourier sums of classes of periodic functions of several variables defined by polyharmonic operators

1980 ◽  
Vol 32 (2) ◽  
pp. 127-132
Author(s):  
N. N. Zaderei
1988 ◽  
Vol 4 (4) ◽  
pp. 356-372 ◽  
Author(s):  
Marek Kowalski ◽  
Waldemar Sielski

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