Kurniawati, Desy, Eka Yusmita, and Edi Nasra. 2021. “Enrichment of Material and Training for Solving Chemistry Olympiad Questions for Teachers at SMAN 1 Ampek Angkek”. Pelita Eksakta 4 (2), 101-3. https://doi.org/10.24036/pelitaeksakta/vol4-iss2/149.