Conditions for Carathéodory functions. Cho, Nak Eun; Kim, In Hwa — 2009 Journal of Inequalities and Applications [electronic only]
A class of integral operators preserving subordination and superordination. Cho, Nak Eun; Kim, In Hwa — 2008 Journal of Inequalities and Applications [electronic only]
Angular estimations of certain integral operators. Cho, Nak Eun; Kim, In Hwa; Kim, Ji A — 1998 International Journal of Mathematics and Mathematical Sciences