M. Ali, A. and M. Abdullah, M. 2021. Schultz and Modified Schultz Polynomials for Vertex – Identification Chain and Ring – for Hexagon Graphs. AL-Rafidain Journal of Computer Sciences and Mathematics. 15, 1 (Jun. 2021), 25–38. DOI:https://doi.org/10.33899/csmj.2021.168251.