Billey, Sara C., and Stephen A. Mitchell. “Affine Partitions and Affine Grassmannians”. The Electronic Journal of Combinatorics 16, no. 2 (July 2, 2009): R18. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v16i2r18.