1. Berens, H., Xu, Y.: On Bernstein-Durrmeyer polynomials with Jacobi weights. In: Chui, C.K. (ed.) Approximation theory and functional analysis (College Station, TX, 1990), pp. 25–46. Academic Press, Boston (1991)
2. Berens, H., Xu, Y.: On Bernstein-Durrmeyer polynomials with Jacobi weights: the cases $$p=1$$ and $$p=\infty $$. In: Baron, S., Leviatan, D. (eds.) Approximation, interpolation, and summation, Jerusalem, 1991, Israel Mathematical Conference Proceedings, vol. 4, pp. 51–62. Weizmann Science Press of Israel, Israel (1991)
3. Cruz-Uribe, D.: Variable Lebesgue spaces: foundations and Harmonic analysis. CRM Preprints, Barcelona (2012)
4. DeVore, R.A., Lorentz, G.G.: A constructive approximation. Springer, Berlin (1993)
5. Ditzian, Z.Z., Ivanov, K.G.: Strong converse inequalities. J. Anal. Math. 61, 61–111 (1993)