Alvarez-Gaumé, L.; Freedman, D. Z.; Mukhi, S. (1981). "The background field method and the ultraviolet structure of the supersymmetric nonlinear σ-model". Annals of Physics. 134 (1): 85–109. Bibcode:1981AnPhy.134...85A. doi:10.1016/0003-4916(81)90006-3.
Alvarez-Gaumé, L.; Freedman, D. Z.; Mukhi, S. (1981). "The background field method and the ultraviolet structure of the supersymmetric nonlinear σ-model". Annals of Physics. 134 (1): 85–109. Bibcode:1981AnPhy.134...85A. doi:10.1016/0003-4916(81)90006-3.