Update reference for DIRX2026 with correct title

Author: paatai

constants/11b.md

@@ -59,6 +59,6 @@ where $|\nabla(A,B)|$ denotes the *normalized* number of edges with one endpoint
 
 - [BIM2023] Beltran, D.; Ivanisvili, P.; Madrid, J. *On sharp isoperimetric inequalities on the hypercube.* [arXiv:2303.06738](https://arxiv.org/abs/2303.06738) (2023).
 - [DIR2024] Durcik, P.; Ivanisvili, P.; Roos, J. *Sharp isoperimetric inequalities on the Hamming cube near the critical exponent.* [arXiv:2407.12674](https://arxiv.org/abs/2407.12674) (2024).
-- [DIRX2026] Durcik, P.; Ivanisvili, P.; Roos, J; Xie, X.  *TBA* TBA (2026)
+- [DIRX2026] Durcik, P.; Ivanisvili, P.; Roos, J; Xie, X.  *Sharp isoperimetric inequalities on the Hamming cube II: The critical exponent* [arXiv:2602.20462](https://arxiv.org/abs/2602.20462) (2026)
 - [Har1966] Harper, L. *Optimal numberings and isoperimetric problems on graphs.* J. Comb. Theory **1** (1966), no. 3, 385–393.
 - [KP2020] Kahn, J.; Park, J. *An isoperimetric inequality for the Hamming cube and some consequences.* Proc. Amer. Math. Soc. **148** (2020), 4213–4224. [arXiv:1909.04274](https://arxiv.org/abs/1909.04274)