“The Effect of Microwave Oven Power Variations on Co-Pyrolysis Process of Oil Palm Shells and Polystyrene: Pengaruh Variasi Daya Microwave Oven Terhadap Proses Co-Pirolisis Cangkang Kelapa Sawit dan Polistirena ” (2022) Procedia of Social Sciences and Humanities, 3, pp. 34–40. doi:10.21070/pssh.v3i.193.