Killian CE, Ruskey F, Savage CD, Weston M. Half-Simple Symmetric Venn Diagrams. Electron. J. Combin. [Internet]. 2004Nov.30 [cited 2026Mar.17];11(1):R86. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v11i1r86