https://ult.fmipa.uho.ac.id/wp-content/upgrade/
Alsait, Amera, and Nagat Alabbar. 2019. “Fekete -Szego Problem for Starlike of Complex Functions of Order Related  to Generalized  Derivative Operator    ”. Journal of Humanitarian and Applied Sciences 4 (8):321-31. https://khsj.elmergib.edu.ly/index.php/jhas/article/view/136.