Cho, Nak Eun, and Shigeyoshi Owa. “On the Fekete-Szego Problem for Strongly $ \alpha $-Quasiconvex Functions”. Tamkang Journal of Mathematics 34, no. 1 (March 31, 2003): 21–28. Accessed July 5, 2022. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/269.