Muhamad, M. S., Johar, M. R., Sunar, N. M., Ali, R., Hamidon, N., Abdul Hamid, N. H. and Harun, H. (2020) “Response Surface Methodology For Optimization Of Sodium Sulphate And Sodium Lauryl Sulphate Removal Using Hydroxyapatite Adsorbent”, Progress in Engineering Application and Technology, 1(1), pp. 127–133. Available at: https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/74 (Accessed: 26 June 2022).