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Additional information
Institute of High-Current Electronics, Siberian Branch, USSR Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 84, No. 2, pp. 173–180. August, 1990.
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Ketov, S.V., Osetrin, K.E. & Prager, Y.S. Geometry of dual two-dimensional nonlinear σ models. Theor Math Phys 84, 794–799 (1990). https://doi.org/10.1007/BF01017676
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DOI: https://doi.org/10.1007/BF01017676