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==External links==
* Ketov, S. V. [http://www.scholarpedia.org/article/Nonlinear_Sigma_model ''Nonlinear Sigma model''] on Scholarpedia.
* U. Kulshreshtha, D.S. Kulshreshtha and H.J.W. Mueller-Kirsten, ``Gauge invariant O(N) [[nonlinear sigma model]](s) and gauge invariant Klein-Gordon theory: Wess-Zumino terms and Hamiltonian and BRST formulations``, Helv.Phys.Acta 66 752-794 (1993); U. Kulshreshtha and D.S. Kulshreshtha, ``Front-form Hamiltonian, path integral and BRST formulations of the [[nonlinear sigma model]]``, Int. J. Theor. Phys. 41, 1941-1956 (2002), DOI: 10.1023/A:1021009008129.
{{Quantum field theories}}
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