Farr, Graham E., and Andrew Y.Z. Wang. “Powerful Sets: A Generalisation of Binary Matroids”. The Electronic Journal of Combinatorics 25, no. 3 (September 7, 2018): #P3.42. Accessed April 19, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v25i3p42.