Utomo, Danang Wahyu, et al. “Quality Improvement for Invisible Watermarking Using Singular Value Decomposition and Discrete Cosine Transform”. MATRIK : Jurnal Manajemen, Teknik Informatika Dan Rekayasa Komputer, vol. 23, no. 3, June 2024, pp. 509-18, https://doi.org/10.30812/matrik.v23i3.3744.