Ebraheem, H. “Isolation of Piperine Compound from Black Pepper Seeds and Synthesis of It Some New Derivatives”. Al-Qadisiyah Journal of Pure Science, Vol. 19, no. 3, July 2017, pp. 128-39, https://www.journalsc.qu.edu.iq.51-77-64-103.cpanel.site/index.php/JOPS/article/view/150.