Differential sandwich theorems of symmetric points associated with Dziok-Srivastava operator (Q2868773)

\textit{K. Sakaguchi} [J. Math. Soc. Japan 11, 72--75 (1959; Zbl 0085.29602)] introduced the class of starlike functions with respect to symmetric points; these are normalized analytic functions \(f\) on the open unit disk satisfying \(\text{Re}(zf'(z)/(f(z)-f(-z))>0\). The authors give some applications of the theory of differential subordination and superordination to certain classes of functions with respect to symmetric points defined by making use of the Dziok-Srivastava convolution operator.