Prabowo, H., R. Hutmi, and I. Dewata. “Optimizing Digging Equipment Productivity Using Overall Equipment Effectiveness (OEE) Method in Coal Overburden Mining Activities”. INVOTEK: Jurnal Inovasi Vokasional Dan Teknologi, Vol. 23, no. 2, Dec. 2023, pp. 99-08, doi:https://doi.org/10.24036/invotek.v23i2.1097.