1.
Jia W, Wang Z, Yu H. Rigidity for the Hopf Algebra of Quasisymmetric Functions. Electron. J. Combin. [Internet]. 2019Jul.5 [cited 2026Mar.16];26(3):P3.4. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v26i3p4