Hollowood, T., Appadu, C., Price, D., & Thompson, D. (2018). Quantum anisotropic sigma and lambda models as spin chains. Journal of Physics A: Mathematical and Theoretical, 51(40), p. 405401. doi:10.1088/1751-8121/aadc6d

Hollowood, Timothy, Calan Appadu, Dafydd Price, and Daniel Thompson. "Quantum Anisotropic Sigma and Lambda Models As Spin Chains." Journal of Physics A: Mathematical and Theoretical 51, no. 40 (2018): 405401.

Hollowood, Timothy, Calan Appadu, Dafydd Price, and Daniel Thompson. "Quantum Anisotropic Sigma and Lambda Models As Spin Chains." Journal of Physics A: Mathematical and Theoretical 51.40 (2018): 405401.