Lattice models and alternating sign matrices II

Source material:

1. Greg Kuperberg. Another proof of the alternating-sign matrix conjecture. Internat. Math. Res. Notices, (3):139–150, 1996.
2. Greg Kuperberg. Symmetry classes of alternating-sign matrices under one roof. Ann. of Math. (2), 156(3):835–866, 2002.
3. Martina Balagović and Stefan Kolb. Universal K-matrix for quantum symmetric pairs. J. Reine Angew. Math., 747:299–353, 2019.