Roslan, F.A.S. and Yub Harun, N. and Saeed, A.A.H. and Ramli, R.M. and Mannikam, S.D. and Hussein Al-Qadami, E.H.  (2022) Methylene Blue Removal Using Palm Oil Mill Effluent Sludge-Derived Adsorbent.  Chemical Engineering Transactions, 91.  pp. 589-594.  ISSN 22839216