1. Monotone approximation by polynomials;DeVore;SIAM J. Math. Anal.,1977
2. Degree of approximation;DeVore,1976
3. Approximation of monotone functions: A counter example;DeVore,1997
4. Pointwise estimates for monotone polynomial approximation;DeVore;Constr. Approx.,1985
5. Introduction to the Theory of Uniform Approximation of Functions by Polynomials;Dzjadyk,1977