Boundedness by 3 of the Whitney Interpolation Constant. - Jacek Gilewicz; Yuri V. Kryakin; Igor A. Shevchuk (J. Approx. Theory, 2002)

Coconvex Approximation. - Dany Leviatan; Igor A. Shevchuk (J. Approx. Theory, 2002)

Coconvex polynomial approximation. - Dany Leviatan; Igor A. Shevchuk (J. Approx. Theory, 2003)

Uniform estimates for polynomial approximation in domains with corners. - F. G. Abdullayev; Igor A. Shevchuk (J. Approx. Theory, 2005)

Positive results and counterexamples in comonotone approximation II. - Dany Leviatan; Igor A. Shevchuk; O. V. Vlasiuk (J. Approx. Theory, 2014)

Yet another look at positive linear operators, q-monotonicity and applications. - Kirill A. Kopotun; Dany Leviatan; Andriy Prymak; Igor A. Shevchuk (J. Approx. Theory, 2016)

Comparing the degrees of unconstrained and shape preserving approximation by polynomials. - Dany Leviatan; Igor A. Shevchuk (J. Approx. Theory, 2016)

On weighted approximation with Jacobi weights. - Kirill A. Kopotun; Dany Leviatan; Igor A. Shevchuk (J. Approx. Theory, 2019)

Exact order of pointwise estimates for polynomial approximation with Hermite interpolation. - Kirill A. Kopotun; Dany Leviatan; Igor A. Shevchuk (J. Approx. Theory, 2021)