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==External links==
* {{cite journal |doi=10.4249/scholarpedia.8508|title=Nonlinear Sigma model|year=2009|last1=Ketov|first1=Sergei|journal=Scholarpedia|volume=4|issue=1|page=8508|doi-broken-date=2024-06-12 |bibcode=2009SchpJ...4.8508K|doi-access=free}}
* {{cite journal |doi=10.1023/A:1021009008129|year=2002|last1=Kulshreshtha|first1=U.|last2=Kulshreshtha|first2=D. S.|s2cid=115710780|title=Front-Form Hamiltonian, Path Integral, and BRST Formulations of the Nonlinear Sigma Model|journal=International Journal of Theoretical Physics|volume=41|issue=10|pages=1941–1956}}
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