Approximation of functions regular in convex polyhedrons by exponential polynomials of a special form von Melnik , Yu. I., Мельник , Ю. И.

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Direct theorems of approximation for the functions regular in convex polygon by exponential polynomials in the integral metrics von Melnik, Yu. I., Мельник, Ю. И.

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Approximation of functions regular in convex polygons by exponential polynomials von Melnik, Yu. I., Мельник, Ю. И.

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Inverse theorems of approximation of regular (in convex polygons) functions by exponential polynomials in the integral metric von Melnik , Yu. I., Мельник , Ю. И.

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