Kostova, V. A. (1987). An exact estimate in the theory of approximation of the function \(x^\alpha\) with Bernstein polynomials in Hausdorff metric. Anal. Numér. Théor. Approx., 16(2), 133-140. https://ictp.acad.ro/jnaat/journal/article/view/1987-vol16-no2-art6