Didenko, V. D., A. A. Korenovskii, and N. J. Tuah. “Numerical Interpretation of the Gurov – Reshetnyak inequality on the Real Line”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 68, no. 12, Dec. 2016, pp. 1607-19, https://umj.imath.kiev.ua/index.php/umj/article/view/1947.