Maarouf, Hamid. “Gröbner Bases Techniques for an $S$-Packing $k$-Coloring of a Graph”. The Electronic Journal of Combinatorics 24, no. 3 (August 25, 2017): P3.33. Accessed March 16, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v24i3p33.