Raihan, R., Effendi, M. S. and Hendrawan, A. (2017) “Forcasting Model Exsponensial Smoothing Time Series Rata Rata Mechanical Availability Unit Off Highway Truck CAT 777D Caterpillar”, POROS TEKNIK, 8(1), pp. 1–9. doi: 10.31961/porosteknik.v8i1.375.