Silitonga, Rifka Helena W, and Mulyono. “Application of Graph Coloring in Compilation of Work Schedules for Dr. General Hospital Nurses Ferdinand Lumbantobing Sibolga”. Formosa Journal of Science and Technology 2, no. 2 (February 26, 2023): 419–432. Accessed May 26, 2026. https://journal.formosapublisher.org/index.php/fjst/article/view/2856.