SharmaA. K. “Norm of a Composition Operator from the Space of Cauchy Transforms into Zygmund-Type Spaces”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 71, no. 12, Dec. 2019, pp. 1699-11, http://umj.imath.kiev.ua/index.php/umj/article/view/367.