Subardin, Muhammad, Didik Susetyo, Syamsurijal A. Kadir, and Suhel Suhel. “Economies of Scale and Efficiency of the Pulp Industry in Indonesia: Cobb-Douglas Cost Function Approach”. International Journal of Economics and Financial Issues 8, no. 4 (July 12, 2018): 284–289. Accessed March 28, 2024. https://econjournals.com/index.php/ijefi/article/view/6724.