Nuroeni, I., A. Kristiana, S. Hussen, S. Setiawani, and R. Adawiyah. “LOCAL IRREGULARITY POINT COLORING ON THE RESULT OF SUBDIVISION OPERATION OF HELM GRAPHS”. Jurnal Diferensial, Vol. 5, no. 2, Oct. 2023, pp. 117-25, doi:10.35508/jd.v5i2.12197.