Best quadrature formula for some classes of periodic differentiable functions

In this work there is solved the problem of the best quadrature formula of the form
$$ \int_0^1f(x)\,dx=\sum_{i=1}^na_if(x_i)+R(f) $$
on the classes of periodic functions $W^r_p$ ($r=1,2,\dots$; $1\leqslant p\leqslant\infty$).
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