Zirar Hussain, Hazha. “Subclass of Harmonic Meromorphic Functions With Fixed Residue ζ”. Journal of Al-Qadisiyah for computer science and mathematics 8, no. 2 (August 7, 2017): 17-24. Accessed August 30, 2021. http://www.qu.edu.iq/journalcm/index.php/journalcm/article/view/29.