Graph Coloring with Approximation Ratios: A Survey of Performance Bounds and Open Problems - Pitale, Rahul; Ahire, Prashant; Tajane, Kapil (2025 9th International Conference on Computing, Communication, Control and Automation (ICCCBEA), Computing, Communication, Control and Automation (ICCCBEA), 2025 9th International Conference on, 2025)