Sali, Attila, and Sam Spiro. “Forbidden Families of Minimal Quadratic and Cubic Configurations”. The Electronic Journal of Combinatorics 24, no. 2 (June 30, 2017): P2.48. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v24i2p48.