Biosynthesis of copper(II) oxide nanoparticles using Murayya koeniggi aqueous leaf extract and its catalytic activity in 4-nitrophenol reduction. Mal. J. Fund. Appl. Sci. [Internet]. 2019 Apr. 16 [cited 2026 Sep. 17];15(2):218-24. Available from: https://mjfas.utm.my/index.php/mjfas/article/view/1390