Harutyunyan, Ararat, Tien-Nam Le, Alantha Newman, and Stéphan Thomasse. “Domination and Fractional Domination in Digraphs”. The Electronic Journal of Combinatorics 25, no. 3 (August 16, 2018): P3.32. Accessed March 15, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v25i3p32.