1. Abramowitz, M., Stegun, I.A.: Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, National Bureau of Standards Applied Mathematics Series, vol. 55. U.S. Government Printing Office, Washington, D.C. (1964)
2. DeVore, R.A., Lorentz, G.G.: Constructive Approximation, vol. 303. Springer, Berlin (1993)
3. Gavrea, I., Ivan, M.: On a conjecture concerning the sum of the squared Bernstein polynomials. Appl. Math. Comput. 241, 70–74 (2014)
4. Gonska, H., Raşa, I., Rusu, M.D.: Chebyshev–Grüss-type inequalities via discrete oscillations. Bul. Acad. Ştiinţe Repub. Mold. Mat. 1, 63–89 (2014)
5. Gradshteyn, I.S., Ryzhik, I.M.: Table of Integrals, Series, and Products, 7th edn. Elsevier/Academic Press, Amsterdam (2007)