http://dglib.uns.ac.id/dokumen/detail/3128/Analisis-optimalisasi-pemeliharaan-mesin-tandem-roller-untuk-mencapai-efisiensi-biaya-pemeliharaan-pada-jasa-penyewaan-alat-berat-Perum-Jasa-Tirta-1-Bengawan-Solohttp://www.rfidjournal.com/articles/view?12339https://www.google.co.id/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CBwQFjAA&url=http%3A%2F%2Fewiworks.com%2Fpdfs%2FNew_Heavy_Mobile_Equipment-2.pdf&ei=b4pYVcOtE5WmuQTWmYPQCw&usg=AFQjCNFCHD0PHDdtD4SHJTiF7PkwFUykrQ&sig2=rbn97dhH45Mdwidu-TVJcg&bvm=bv.93564037,d.c2Ejurnal
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