Bishnoi, Anurag, Sam Mattheus, and Jeroen Schillewaert. “Minimal Multiple Blocking Sets”. The Electronic Journal of Combinatorics 25, no. 4 (December 21, 2018): P4.66. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v25i4p66.