Pavlič, Polona, and Janez Žerovnik. “Roman Domination Number of the Cartesian Products of Paths and Cycles”. The Electronic Journal of Combinatorics 19, no. 3 (August 9, 2012): P19. Accessed April 1, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v19i3p19.