Purba RK, Hutagalung DFG, Sinaga EM, Sidabutar A, Mesran M. Optimalisasi dalam Penentuan Keputusan Level Pemberlakuan Pembatasan Kegiatan Masyarakat (PPKM) Menerapkan Metode Preference Selection Index. josh [Internet]. 31Jan.2022 [cited 15Jun.2026];3(2):63-5. Available from: https://ejurnal.seminar-id.com/index.php/josh/article/view/1247