Leonchik, E. Y. “On an Estimate for the Rearrangement of a Function from the Muckenhoupt Class $A_1$”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 62, no. 8, Aug. 2010, pp. 1145–1148, https://umj.imath.kiev.ua/index.php/umj/article/view/2944.