Mechanical Properties and Toxicity Characteristic of Petroleum Sludge Incorporated with Palm Oil Fuel Ash and Quarry Dust in Solidification/Stabilization Matrices - Mohd Ikhmal Haqeem Hassan; Aeslina Abdul Kadir; Nor Amani Filzah Mohd Kamil; Nurul Nabila Huda Hashar; Noor Amira Sarani; Badaruddin Ibrahim; Kahirol Mohd Salleh; Mohd Mustafa Al Bakri Abdullah (Archives of Metallurgy and Materials, 2022)