Binti Abd Kadir, A.; Rozaimah Sheikh Abdullah, S.; Abu Hasan, H. Comparative Phytotoxicity of Azolla Pinnata and Lemna Minor in Treated Palm Oil Mill Effluent. IJET 2018, 7 (4), 2499-2505. https://doi.org/10.14419/ijet.v7i4.12287.