S. Suwandi and K. Subyantoro, “Review on the Opinions about the Aplication of Diminishing Returns Law”, IJSBAR, vol. 29, no. 1, pp. 155–163, Aug. 2016, Accessed: Oct. 01, 2025. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/6104