Desiani, Anita, et al. “Combination Contrast Stretching and Adaptive Thresholding for Retinal Blood Vessel Image”. MATRIK : Jurnal Manajemen, Teknik Informatika Dan Rekayasa Komputer, vol. 22, no. 1, Nov. 2022, pp. 1-12, doi:10.30812/matrik.v22i1.1654.