Broere, Izak, and Monika Pilśniak. “The Distinguishing Index of Infinite Graphs”. The Electronic Journal of Combinatorics 22, no. 1 (March 30, 2015): P1.78. Accessed March 15, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v22i1p78.