Knutson, Allen, Terence Tao, and Christopher Woodward. “A Positive Proof of the Littlewood-Richardson Rule Using the Octahedron Recurrence”. The Electronic Journal of Combinatorics 11, no. 1 (September 13, 2004): #R61. Accessed May 25, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v11i1r61.