Hidayatulloh, Nurma M., and Tedjo Sukmono. “Determination of Production Instrumentation Equipment Maintenance Intervals In the Paper Industry: Penentuan Interval Perawatan Peralatan Instrumentasi Produksi Pada Industri Kertas”. PROZIMA (Productivity, Optimization and Manufacturing System Engineering), vol. 4, no. 1, Mar. 2021, pp. 23-31, doi:10.21070/prozima.v4i1.1275.