Marzuki, C. C., E. N. T. Sihombing, A. Abdussakir, and A. N. Rahma. “Nilai Ketakteraturan Total Dari Lima Copy Graf Bintang”. Jurnal Fourier, vol. 9, no. 2, Oct. 2020, pp. 75-83, https://fourier.or.id/index.php/FOURIER/article/view/116.