Tatsuhiro Misumi, Yuya Tanizaki, Mithat Ünsal, “Fractional θ angle, 't Hooft anomaly, and quantum instantons in charge-q multi-flavor Schwinger model”, J. High Energ. Phys., 2019:7 (2019)
Shota Komatsu, Raghu Mahajan, Shu-Heng Shao, “An index for quantum integrability”, SciPost Phys., 7:5 (2019)
Yuki Amari, Nobuyuki Sawado, “BPS sphalerons in the F2 nonlinear sigma model”, Phys. Rev. D, 97:6 (2018)
Christof Gattringer, Daniel Göschl, Tin Sulejmanpašić, “Dual simulation of the 2d U(1) gauge Higgs model at topological angle θ = π: Critical endpoint behavior”, Nuclear Physics B, 935 (2018), 344
Yuki Amari, Nobuyuki Sawado, “SU(3) knot solitons: Hopfions in the F2 Skyrme–Faddeev–Niemi model”, Physics Letters B, 784 (2018), 294
Yuya Tanizaki, Tin Sulejmanpasic, “Anomaly and global inconsistency matching: θ angles, SU(3)/U(1)2 nonlinear sigma model, SU(3) chains, and generalizations”, Phys. Rev. B, 98:11 (2018)
Dmitri Bykov, “Integrable properties of $\sigma$-models with non-symmetric target spaces”, Nuclear Phys. B, 894 (2015), 254–267
D. Bykov, “The geometry of antiferromagnetic spin chains”, Comm. Math. Phys., 322:3 (2013), 807–834