A. M. Adhitama, B. Hilmi, S. S. Santi, S. Susilowati, and S. Suprihati, “Synthesis and Characterization of Sodium Lignosulfonate from Teak Wood Sawdust Lignin via Indirect Sulfonation”, ajarcde, vol. 10, no. 2, pp. 423–427, Jun. 2026.