Febrianto, Galih Ramadhan, and Muhammad Sirojuddin Amin. “Measuring the Effect of COVID-19 on Bank Cost Efficiency in Indonesia Using Stochastic Frontier Analysis: Conventional Vs Islamic Evidence”. Law and Economics 20, no. 1 (February 28, 2026): 41–49. Accessed April 21, 2026. https://journals.ristek.or.id/index.php/LE/article/view/294.