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V. D. Kuznetsov Siberian Physicotechnical Scientific-Research Institute at the State University, Tomsk. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 71, No. 2, pp. 226–237, May, 1987.
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Ketov, S.V., Lokhvitskii, B.B. & Tyutin, I.V. Hyper-Kähler sigma models in extended superspace. Theor Math Phys 71, 496–504 (1987). https://doi.org/10.1007/BF01028649
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DOI: https://doi.org/10.1007/BF01028649