1.
Soukal R, Holub P. A Note on Packing Chromatic Number of the Square Lattice. Electron. J. Combin. [Internet]. 2010Mar.15 [cited 2026Mar.17];17(1):N17. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v17i1n17