Binti Abd Kadir, Azlin, Siti Rozaimah Sheikh Abdullah, and Hassimi Abu Hasan. “Comparative Phytotoxicity of Azolla Pinnata and Lemna Minor in Treated Palm Oil Mill Effluent”. International Journal of Engineering and Technology 7, no. 4 (September 24, 2018): 2499–2505. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/12287.