Sasmitha, H. M., Kusumaningtyas, P., Erika, F. and Sumarioto, S. (2024) “Improving problems solving skills through problem-based learning of oil palm empty fruit bunch waste in science learning for students at SMAN 1 Muara Badak”, Educational Studies: Conference Series, 4(2), pp. 111–1116. doi: 10.30872/escs.v4i2.4630.