Sidabutar, Ros Anita, Johan Oberlyn Simanjuntak, and Josua Marganda Simangunsong. 2022. “Pengaruh Penambahan Serat Ijuk Terhadap Kuat Tekan Beton ”. Jurnal Visi Eksakta 3 (1):51-58. https://doi.org/10.51622/eksakta.v3i1.570.