A. Akter, M. Goto, M. Mohd Noor, A. Muzahidul Islam, U. Motoo, Z. Ya, A. Parvez, Immobilization of Heavy Metals in Tannery Sludge by Subcritical water Treatment, Chemical Engineering Transactions. 56 (2017) 265-270. doi:10.3303/CET1756045.