The purpose of the present paper is to investigate some subordination- and superordination-preserving properties of certain integral operators defined on the space of meromorphic functions in the punctured open unit disk. The sandwich-type theorem for these integral operators is also considered.
"A Class of Nonlinear Integral Operators Preserving Double Subordinations." Abstr. Appl. Anal. 2008 1 - 10, 2008. https://doi.org/10.1155/2008/792160