herliati H, Asyha DP, Nulhakim L. Optimasi Clinker Ratio Pada Portland Pozzoland Cement (PPC) Dengan Pozzoland Fly ash. J. Migasian [Internet]. 2020 Dec. 31 [cited 2026 Oct. 25];4(2):11-7. Available from: http://ojs.itpb.ac.id/index.php/jurnal-migasian/article/view/126