H. H. Deifalla, Mohamad, et al. “Staged Catalytic Co-Pyrolysis of Polypropylene and High-Density Polyethylene: Optimizing Liquid Fuel Yield and Composition”. Engineering And Technology Journal, vol. 10, no. 10, Oct. 2025, pp. 7265-73, doi:10.47191/etj/v10i10.06.