Mamoto, Rivco, Stenly Tangkuman, and Michael E Rembet. 2017. “METODE PREDIKSI BERBASIS GREY MODEL UNTUK PROGNOSIS PERAMBATAN RETAK”. JURNAL POROS TEKNIK MESIN UNSRAT 6 (2). https://ejournal.unsrat.ac.id/v3/index.php/poros/article/view/18892.