“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 ”, pssh, vol. 3, pp. 34–40, May 2022, doi: 10.21070/pssh.v3i.193.