HAJIR, S. .; WIRMA, C. Analysis Effect of Adding Sodium Lignosulfonate / black liquor on the Compressive Strength of Concrete. Chempro, [S. l.], v. 1, n. 01, p. 13–15, 2024. Disponível em: https://ejurnal.unival-cilegon.ac.id/index.php/chem/article/view/311. Acesso em: 3 nov. 2025.