Alfarano, Gianira N., Eimear Byrne, and Andrew Fulcher. “The Free Product of $q$-Matroids”. The Electronic Journal of Combinatorics 32, no. 3 (September 19, 2025): P3.52. Accessed March 30, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v32i3p52.