Indupurnahayu, I.; Setiawan, E. B.; Agusinta, L.; Suryawan, R. F.; Ricardianto, P.; Sari, M.; Mulyono, S.; Sakti, R. F. J. Changes in Demand and Supply of the Crude Oil Market During the COVID-19 Pandemic and Its Effects on the Natural Gas Market. IJEEP 2021, 11, 1-6.