Saarela, Aleksi, and Aleksi Vanhatalo. “A Connection Between Unbordered Partial Words and Sparse Rulers”. The Electronic Journal of Combinatorics 33, no. 1 (February 27, 2026): P1.40. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v33i1p40.