Liu, Rudy X. J. “Set Systems With Restricted $t$-Wise Intersections Modulo Prime Powers”. The Electronic Journal of Combinatorics 16, no. 1 (June 5, 2009): N17. Accessed March 16, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v16i1n17.