Dohmen, Klaus, and Peter Tittmann. “Bonferroni-Galambos Inequalities for Partition Lattices”. The Electronic Journal of Combinatorics 11, no. 1 (November 30, 2004): R85. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v11i1r85.