Suripto, Suripto, and Supriyanto Supriyanto. 2021. “The Effect of the COVID-19 Pandemic on Stock Prices With the Event Window Approach: A Case Study of State Gas Companies, in the Energy Sector”. International Journal of Energy Economics and Policy 11 (3):155-62. https://econjournals.com./index.php/ijeep/article/view/10999.