Stechkin-type estimate for nearly copositive approximation of periodic functions von H. A. Dziubenko

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Almost coconvex approximation of continuous periodic functions von H. A. Dziubenko

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Pointwise estimation of an almost copositive approximation of continuous functions by algebraic polynomials von H. A. Dziubenko

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A cubic spline of tri-monotone approximation von H. A. Dziubenko

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Restrictions for order of q-monotone approximation of periodic functions von H. A. Dziubenko

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An interpolatory estimate for copositive polynomial approximations of continuous functions von H. A. Dziubenko

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Degree of comonotone approximation of periodic functions von H. A. Dziubenko

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