D. . Soraya Tanjung, Daryono, and A. . Tsalasuna R, “THE EFFECT OF SOAKING ARECA NUT (Areca catechu Linn.) SEED EXTRACT ON THE SURFACE ROUGHNESS OF NANOHYBRID COMPOSITE RESIN IN-VITRO STUDY”, JHDS, vol. 5, no. 3, pp. 233–242, Feb. 2026.